DMSC Integration Testing

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00004539.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:343: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00004392.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:343: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00004252.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00004224.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00004105.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003965.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003909.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003893.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003753.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003606.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003466.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003326.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003186.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003144.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003137.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003123.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003123.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00003039.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00002899.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00002766.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00002626.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00002486.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00002437.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00002339.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00002199.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00002059.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00001919.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00001288.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00001288.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00001211.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00001071.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00000987.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00000931.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00000875.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00000854.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00000854.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00000371.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00000329.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00000322.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00000322.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError

workflow =
coda_nexus_file_path = PosixPath('/ess/data/coda/2025/999999/raw/bifrost_999999_00000322.hdf')

def test_can_compute_tof(
workflow: sciline.Pipeline, coda_nexus_file_path: Path
) -> None:
workflow[Filename[SampleRun]] = coda_nexus_file_path
workflow[TimeOfFlightLookupTableFilename] = tof_lookup_table_simulation()

> result = workflow.compute(DetectorTofData[SampleRun])
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/nexusfiles-scipp/bifrost/bifrost_reduction_test.py:30:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/pipeline.py:191: in compute
return self.get(tp, **kwargs).compute(reporter=reporter)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/task_graph.py:122: in compute
return self._scheduler.get(self._graph, [targets], reporter=reporter)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/scheduler.py:64: in get
results[t] = reporter.call_provider_with_reporting(graph[t], results)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/reporter.py:398: in call_provider_with_reporting
return provider.call(values)
^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/sciline/_provider.py:144: in call
return self._func(
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:38: in load_instrument_angle
return InstrumentAngle[RunType](_load_experiment_parameter(file_spec, "a4"))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/bifrost/io/nexus.py:49: in _load_experiment_parameter
parameters = _unique_child_group(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

group =
nx_class = , name = None

def _unique_child_group(
group: snx.Group, nx_class: type[snx.NXobject], name: str | None
) -> snx.Group:
if name is not None:
child = group[name]
if isinstance(child, snx.Field):
raise ValueError(
f"Expected a NeXus group as item '{name}' but got a field."
)
if child.nx_class != nx_class:
raise ValueError(
f"The NeXus group '{name}' was expected to be a "
f'{nx_class} but is a {child.nx_class}.'
)
return child

children = group[nx_class]
if len(children) != 1:
> raise ValueError(
f"Expected exactly one {nx_class.__name__} group '{group.name}', "
f"got {len(children)}"
)
E ValueError: Expected exactly one NXparameters group '/entry', got 0

.tox/nexusfiles-scipp-bifrost/lib/python3.12/site-packages/ess/reduce/nexus/_nexus_loader.py:241: ValueError