def _ensure_only_one_capture_fixture(request: FixtureRequest, name):
fixtures = sorted(set(request.fixturenames) & capture_fixtures - {name})
if fixtures:
arg = fixtures[0] if len(fixtures) == 1 else fixtures
raise request.raiseerror(
"cannot use {} and {} at the same time".format(arg, name)
)
def _capturing_for_request(
self, request: FixtureRequest
) -> Generator["CaptureFixture", None, None]:
"""
Context manager that creates a ``CaptureFixture`` instance for the
given ``request``, ensuring there is only a single one being requested
at the same time.
This is used as a helper with ``capsys``, ``capfd`` etc.
"""
if self._capture_fixture:
other_name = next(
k
for k, v in map_fixname_class.items()
if v is self._capture_fixture.captureclass
)
raise request.raiseerror(
"cannot use {} and {} at the same time".format(
request.fixturename, other_name
)
)
capture_class = map_fixname_class[request.fixturename]
self._capture_fixture = CaptureFixture(capture_class, request)
self.activate_fixture()
yield self._capture_fixture
self._capture_fixture.close()
self._capture_fixture = None
