[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

tests/lib/fixture.py

@@ -159,7 +159,7 @@ def _factory(number: int = 0) -> ResultManager:
     return _factory
 
 
-@pytest.fixture()
+@pytest.fixture
 def result_manager() -> ResultManager:
     """Return a ResultManager with 30 random tests loaded from a JSON file.