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TST: Cache available interactive backends #27422

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Merged
merged 1 commit into from
Dec 3, 2023
Merged

TST: Cache available interactive backends #27422

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26 changes: 15 additions & 11 deletions lib/matplotlib/tests/test_backends_interactive.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
import functools
import importlib
import importlib.util
import inspect
Expand Down Expand Up @@ -52,7 +53,10 @@ def wait_for(self, terminator):
# PyPI-installable on CI. They are not available for all tested Python
# versions so we don't fail on missing backends.

def _get_testable_interactive_backends():
@functools.lru_cache
def _get_available_interactive_backends():
_is_linux_and_display_invalid = (sys.platform == "linux" and
not _c_internal_utils.display_is_valid())
envs = []
for deps, env in [
*[([qt_api],
Expand All @@ -70,8 +74,7 @@ def _get_testable_interactive_backends():
]:
reason = None
missing = [dep for dep in deps if not importlib.util.find_spec(dep)]
if (sys.platform == "linux" and
not _c_internal_utils.display_is_valid()):
if _is_linux_and_display_invalid:
reason = "$DISPLAY and $WAYLAND_DISPLAY are unset"
elif missing:
reason = "{} cannot be imported".format(", ".join(missing))
Expand All @@ -85,8 +88,7 @@ def _get_testable_interactive_backends():
reason = "no usable GTK bindings"
marks = []
if reason:
marks.append(pytest.mark.skip(
reason=f"Skipping {env} because {reason}"))
marks.append(pytest.mark.skip(reason=f"Skipping {env} because {reason}"))
elif env["MPLBACKEND"].startswith('wx') and sys.platform == 'darwin':
# ignore on OSX because that's currently broken (github #16849)
marks.append(pytest.mark.xfail(reason='github #16849'))
Expand All @@ -97,15 +99,17 @@ def _get_testable_interactive_backends():
):
marks.append( # https://github.com/actions/setup-python/issues/649
pytest.mark.xfail(reason='Tk version mismatch on Azure macOS CI'))
envs.append(
pytest.param(
{**env, 'BACKEND_DEPS': ','.join(deps)},
marks=marks, id=str(env)
)
)
envs.append(({**env, 'BACKEND_DEPS': ','.join(deps)}, marks))
return envs


def _get_testable_interactive_backends():
# We re-create this because some of the callers below might modify the markers.
return [pytest.param({**env}, marks=[*marks],
id='-'.join(f'{k}={v}' for k, v in env.items()))
for env, marks in _get_available_interactive_backends()]


def is_ci_environment():
# Common CI variables
ci_environment_variables = [
Expand Down