Test Coverage Verification

Purpose

Ensures all production code in the ML pipeline has adequate test coverage:

1. •Model test coverage — Every model in IMPLEMENTED_MODELS must have an integration test in tests/pipeline/test_train.py or tests/pipeline/test_train_csr.py
2. •Module test coverage — New modules under recommender/ must have corresponding test files under tests/
3. •Test naming convention — Test files must follow test_{module_name}.py, test classes Test{ComponentName}, test methods test_{behavior}
4. •Fixture completeness — New models requiring custom config must have fixtures in tests/conftest.py

When to Run

• •After adding a new model to ModelName enum or IMPLEMENTED_MODELS
• •After adding new modules under recommender/ (model, preprocess, load_data, libs, etc.)
• •After modifying RecommenderBase abstract methods
• •Before creating a Pull Request

Related Files

Workflow

Step 1: Check All Registered Models Have Integration Tests

Tool: Grep, Read

Extract all model names from IMPLEMENTED_MODELS:

grep -n "ModelName\." recommender/libs/constant/model/name.py

Then verify each model name appears in integration test files as a parametrized test case or dedicated test:

grep -n '"svd"\|"svd_bias"\|"gmf"\|"mlp"\|"two_tower"' tests/pipeline/test_train.py
grep -n '"als"\|"user_based"' tests/pipeline/test_train_csr.py

PASS: Every model in IMPLEMENTED_MODELS has a corresponding integration test (either parametrized in test_train.py/test_train_csr.py or in a dedicated test file).

FAIL: A model is registered but has no integration test.

Fix: Add a parametrized test case to tests/pipeline/test_train.py (torch models) or tests/pipeline/test_train_csr.py (CSR models).

Step 2: Check New Source Modules Have Test Files

Tool: Glob, Grep

List all Python modules under recommender/ (excluding __init__.py, __pycache__):

find recommender -name "*.py" -not -name "__init__.py" -not -path "*__pycache__*" | sort

List all test files:

find tests -name "test_*.py" | sort

For each source module directory (model/, preprocess/, load_data/, libs/, etc.), verify at least one corresponding test file exists under tests/.

PASS: Every source module directory with production logic has at least one test file.

FAIL: A source module directory has no corresponding test file under tests/.

Fix: Create tests/module/{module}/test_{component}.py with appropriate tests.

Step 3: Check Test File Naming Convention

Tool: Glob

find tests -name "*.py" -not -name "test_*" -not -name "conftest.py" -not -name "__init__.py" -not -path "*__pycache__*"

PASS: All test files follow test_{name}.py naming (except conftest.py, __init__.py).

FAIL: Test files found that don't follow the naming convention.

Fix: Rename to test_{descriptive_name}.py.

Step 4: Check Test Class and Method Naming

Tool: Grep

grep -rn "^class " tests/ --include="*.py" | grep -v "^.*:class Test"

grep -rn "def test" tests/ --include="*.py" | grep -v "def test_"

PASS: All test classes use Test{Name} and all test methods use test_{description}.

FAIL: Classes or methods not following naming convention.

Fix: Rename to Test{ComponentName} / test_{behavior_description}.

Step 5: Check New Models Have Config Fixtures

Tool: Read

Read tests/conftest.py and check that the setup_config fixture can provide config for all models. Verify the fixture parameters cover all model/loss/dataset combinations used in integration tests.

PASS: Every registered model has a config fixture available.

FAIL: A model is registered but has no config fixture coverage.

Fix: Add a fixture parameter set to tests/conftest.py following the existing setup_config pattern.

Output Format

| # | Check | Status | Details |
|---|-------|--------|---------|
| 1 | Registered model integration tests | PASS/FAIL | List of untested models |
| 2 | Module test coverage | PASS/FAIL | List of uncovered modules |
| 3 | Test file naming | PASS/FAIL | List of misnamed files |
| 4 | Test class/method naming | PASS/FAIL | List of violations |
| 5 | Config fixtures | PASS/FAIL | List of missing fixtures |

Exceptions

1. •Utility modules — recommender/libs/utils/ helper files (e.g., logger.py, parse_args.py, utils.py) do not require dedicated test files unless they contain complex logic
2. •__init__.py files — These are re-export files and do not need tests
3. •Script files — Files in scripts/ are one-off download scripts and are exempt
4. •Abstract base classes — recommender_base.py, torch_model_base.py, fit_model_base.py are tested indirectly through concrete model implementations
5. •Constant files — Files under recommender/libs/constant/ are simple value definitions and do not need dedicated tests