Python: Also test pytest fixture factories

Author: tausbn

python/ql/test/query-tests/Imports/unused/UnusedImport.expected

@@ -5,4 +5,5 @@
 | imports_test.py:10:1:10:22 | Import | Import of 'top_level_cycle' is not used. |
 | imports_test.py:27:1:27:25 | Import | Import of 'func2' is not used. |
 | imports_test.py:34:1:34:14 | Import | Import of 'module2' is not used. |
-| imports_test.py:116:1:116:67 | Import | Import of 'not_a_fixture' is not used. |
+| imports_test.py:116:1:116:85 | Import | Import of 'fixture_instance' is not used. |
+| imports_test.py:116:1:116:85 | Import | Import of 'not_a_fixture' is not used. |

python/ql/test/query-tests/Imports/unused/imports_test.py

@@ -113,4 +113,4 @@ def baz() -> Optional['subexpression_return_type']:
     pass
 
 
-from pytest_fixtures import fixture, wrapped_fixture, not_a_fixture
+from pytest_fixtures import fixture, wrapped_fixture, fixture_instance, not_a_fixture

python/ql/test/query-tests/Imports/unused/pytest_fixtures.py

@@ -15,5 +15,11 @@ def delegate():
 def wrapped_fixture():
     pass
 
+@pytest.fixture(scope='session', autorun=True)
+def factory_fixture():
+    pass
+
+fixture_instance = factory_fixture()
+
 def not_a_fixture():
     pass