add test for loading EmptyDetector

Author: nvaytet

tests/conftest.py

@@ -63,7 +63,7 @@ def tbl_registry() -> Registry:
     return make_registry(
         'ess/tbl',
         files={
-            "857127_00000112_small.hdf": "md5:be5741892537a264c6f5df009a7c2881",
+            "857127_00000112_small.hdf": "md5:0db89493b859dbb2f7354c3711ed7fbd",
         },
         version='2',
     )

tests/nexus/workflow_test.py

@@ -13,6 +13,7 @@
     BackgroundRun,
     Beamline,
     EmptyBeamRun,
+    EmptyDetector,
     Filename,
     FrameMonitor0,
     FrameMonitor1,
@@ -596,6 +597,20 @@ def test_load_histogram_detector_workflow(tbl_commissioning_orca_file: Path) ->
     assert da.ndim == 3
 
 
+def test_load_empty_histogram_detector_workflow(
+    tbl_commissioning_orca_file: Path,
+) -> None:
+    wf = LoadDetectorWorkflow(run_types=[SampleRun], monitor_types=[])
+    wf[Filename[SampleRun]] = tbl_commissioning_orca_file
+    wf[NeXusName[snx.NXdetector]] = 'orca_detector'
+    da = wf.compute(EmptyDetector[SampleRun])
+    assert 'position' in da.coords
+    assert da.bins is None
+    # The empty detector has no time dimension, only the dimensions of the geometry
+    assert 'time' not in da.dims
+    assert da.ndim == 2
+
+
 @pytest.mark.parametrize('preopen', [True, False])
 def test_generic_nexus_workflow(
     preopen: bool, loki_tutorial_sample_run_60250: Path