Add Tests And CI

Add Tests and CI

Add reliable tests and integrate them with slime CI flow.

When to Use

Use this skill when:

• User asks to add tests for new behavior
• User asks to fix or update existing tests in tests/
• User asks to update CI workflow behavior
• User asks how to run targeted checks before PR

Step-by-Step Guide

Step 1: Pick the Right Test Pattern

• Follow existing naming: tests/test_<feature>.py
• Start from nearest existing test file for your model/path
• Keep test scope small and behavior-focused

Step 2: Keep CI Compatibility

• CI executes registered test files with python tests/<file>.py, not only pytest discovery. New CPU pytest files should include:

import pytest

NUM_GPUS = 0

if __name__ == "__main__":
    raise SystemExit(pytest.main([__file__]))

• run-ci-changed extracts a top-level NUM_GPUS = <N> constant from added/modified tests/test_*.py and tests/plugin_contracts/test_*.py; if missing, it defaults to 8 GPUs. Set NUM_GPUS = 0 for CPU-only tests.
• For GPU/e2e tests, follow the nearby file pattern (prepare(), execute(), NUM_GPUS, and any model/dataset constants).

Step 3: Register Tests in GitHub CI

Whenever adding, moving, or renaming a test file, update the GitHub workflow template before finishing:

1. Add the test to the appropriate matrix in .github/workflows/pr-test.yml.j2.
   • CPU-only pytest/unit tests usually belong in cpu-unittest with num_gpus: 0.
   • GPU/e2e tests should be placed beside the nearest similar model/path test with the matching num_gpus and environment fields.
2. Regenerate workflows:

python .github/workflows/generate_github_workflows.py

3. Include both .github/workflows/pr-test.yml.j2 and the generated .github/workflows/pr-test.yml in the change set.

Only skip fixed matrix registration when the test is intentionally helper-only or manually invoked; state that reason in the final response.

Step 4: Run Local Validation

• Run the exact existing test files you changed, if any.
• For new registered tests, run the same shape CI will use, for example python tests/test_new_file.py.
• Run repository-wide checks only when they are already part of the task or workflow.
• Avoid documenting placeholder test commands that may not exist in the current tree.

Step 5: Keep Workflow Template as Source of Truth

For CI workflow changes unrelated to a new, moved, or renamed test:

1. Edit .github/workflows/pr-test.yml.j2
2. Regenerate workflows:

python .github/workflows/generate_github_workflows.py

3. Include both the template and generated workflow file in the change set (.j2 and .yml). If the user asked for a commit, commit both.

Step 6: Provide Verifiable PR Notes

Include:

• Which tests were added/changed
• Where each new/renamed test was registered in .github/workflows/pr-test.yml.j2
• Exact commands executed
• GPU assumptions for each test path
• Why this coverage protects against regression

Common Mistakes

• Editing generated workflow file only
• Relying on run-ci-changed discovery for a new test that should run in the regular PR matrix
• Forgetting NUM_GPUS = 0 on a CPU-only changed test, causing run-ci-changed to default to 8 GPUs
• Adding a CPU pytest file that passes under pytest tests/foo.py but fails under CI's python tests/foo.py
• Adding tests without following existing constants/conventions
• Making tests too large or non-deterministic
• Skipping local validation and relying only on remote CI

Reference Locations

• Pytest config: pyproject.toml
• Tests: tests/
• CI template: .github/workflows/pr-test.yml.j2
• CI guide: docs/en/developer_guide/ci.md