Mock test_class_labels in test_learning_curve_task.py

[anuj452005]

Metadata

• Reference Issue: [MNT] Replace Live Server Calls with Mocks in Unit Tests #1649
• New Tests Added: No (Modified existing tests)
• Documentation Updated: No
• Change Log Entry: "Mock test_class_labels in test_tasks/test_learning_curve_task.py to use offline fixtures"

Details

This PR converts the test_class_labels test in test_tasks/test_learning_curve_task.py from a live server test (using @pytest.mark.test_server()) to an offline mocked test.

It implements the following changes:

• Refactored test_class_labels into a module-level function and removed it from OpenMLLearningCurveTaskTest.
• Used @mock.patch.object(requests.Session, "get") to intercept HTTP calls made by get_task(801).
• Added three new XML fixtures in tests/files/mock_responses/tasks/ to simulate the API call chain:
  1. task_801.xml: The Learning Curve task description.
  2. data_description_20.xml: The dataset description (dataset 20 - diabetes).
  3. data_features_20.xml: The dataset features, providing the necessary class labels for validation.

python -m pytest tests/test_tasks/test_learning_curve_task.py::test_class_labels -v