def _resolve_single_arg(self, arg: Callable,
cache: FixtureCache) -> Union[Any, Fixture]:
"""
Get the fixture return value
If the fixture has been cached, return the value from the cache.
Otherwise, call the fixture function and return the value.
"""
if not hasattr(arg, "ward_meta"):
return arg
fixture = Fixture(arg)
if cache.contains(fixture, fixture.scope,
self.scope_key_from(fixture.scope)):
return cache.get(fixture.key, fixture.scope,
self.scope_key_from(fixture.scope))
has_deps = len(fixture.deps()) > 0
is_generator = fixture.is_generator_fixture
if not has_deps:
try:
if is_generator:
fixture.gen = arg()
fixture.resolved_val = next(fixture.gen)
else:
fixture.resolved_val = arg()
except Exception as e:
raise FixtureError(
f"Unable to resolve fixture '{fixture.name}'") from e
scope_key = self.scope_key_from(fixture.scope)
cache.cache_fixture(fixture, scope_key)
return fixture
children_defaults = self._get_default_args(func=arg)
children_resolved = {}
for name, child_fixture in children_defaults.items():
child_resolved = self._resolve_single_arg(child_fixture, cache)
children_resolved[name] = child_resolved
try:
args_to_inject = self._unpack_resolved(children_resolved)
if is_generator:
fixture.gen = arg(**args_to_inject)
fixture.resolved_val = next(fixture.gen)
else:
fixture.resolved_val = arg(**args_to_inject)
except Exception as e:
raise FixtureError(
f"Unable to resolve fixture '{fixture.name}'") from e
scope_key = self.scope_key_from(fixture.scope)
cache.cache_fixture(fixture, scope_key)
return fixture
def _(f=exception_raising_fixture):
cache = FixtureCache()
cache.cache_fixture(f, "test_id")
assert cache.get(f.key, Scope.Test, "test_id") == f
def _(f=exception_raising_fixture):
cache = FixtureCache()
cache.cache_fixture(f, "test_id")
expect(cache.get(f.key, Scope.Test, "test_id")).equals(f)
