x01dcandClaude Sonnet 5
d237357012
Surfaced live on a simulated flomni session: tomo_scan_projection()
crashed with "DeviceConfigError: Device filter_array_1_x does not
exist" -- the real beamline's four filter_array_*_x devices
(bl_endstation.yaml) aren't part of any endstation simulation config,
by design (out of scope for an isolated endstation sim, same as
frontend/optics-hutch/detector devices).
filters_out_of_beam() already tried to skip a missing device via
getattr(dev, axis_name, None), but BEC's device container raises
DeviceConfigError -- a plain Exception, not AttributeError -- for a
missing device, so getattr's default never applied. Wrap the lookup
in try/except instead, which also preserves the pre-existing (and
apparently relied-upon, per several LamNI tests) behavior of `dev`
itself being None -- the usual state of this codebase's
`dev = builtins.__dict__.get("dev")` idiom before a real session sets
it.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Lx3KffiFyyDMKT8vvPENUW
Getting Started with Testing using pytest
BEC is using the pytest framework. It can be installed via
pip install pytest
in your python environment.
We note that pytest is part of the optional-dependencies [dev] of the plugin package.
Introduction
Tests in this package should be stored in the tests directory.
We suggest to sort tests of different submodules, i.e. scans or devices in the respective folder structure, and to folow a naming convention of <test_module_name.py>.
It is mandatory for test files to begin with test_ for pytest to discover them.
To run all tests, navigate to the directory of the plugin from the command line, and run the command
pytest -v --random-order ./tests
Note, the python environment needs to be active.
The additional arg -v allows pytest to run in verbose mode which provides more detailed information about the tests being run.
The argument --random-order instructs pytest to run the tests in random order, which is the default in the CI pipelines.
Test examples
Writing tests can be quite specific for the given function. We recommend writing tests as isolated as possible, i.e. try to test single functions instead of full classes. A very useful class to enable isolated testing is MagicMock. In addition, we also recommend to take a look at the How-to guides from pytest.