Improve failure message in test utility code.

lsst · Jan 13, 2023 · 27db031 · 27db031
1 parent 58d3d62
commit 27db031
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/python/lsst/pipe/base/tests/pipelineStepTester.py b/python/lsst/pipe/base/tests/pipelineStepTester.py
@@ -103,7 +103,13 @@ def run(self, butler: Butler, test_case: unittest.TestCase) -> None:
             all_outputs.update(dataset_types.intermediates.asMapping())
 
             for name in dataset_types.inputs.names & all_outputs.keys():
-                test_case.assertTrue(all_outputs[name].is_compatible_with(dataset_types.inputs[name]))
+                test_case.assertTrue(
+                    all_outputs[name].is_compatible_with(dataset_types.inputs[name]),
+                    msg=(
+                        f"dataset type {name} is defined as {dataset_types.inputs[name]} as an "
+                        f"input, but {all_outputs[name]} as an output, and these are not compatible."
+                    ),
+                )
 
             for dataset_type in dataset_types.outputs | dataset_types.intermediates:
                 if not dataset_type.isComponent():