| name | add-tests-and-ci |
| description | Guide for adding or updating slime tests and CI wiring. Use when tasks require new test cases, CI registration, test matrix updates, or workflow template changes. |
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:
- 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.
- Regenerate workflows:
python .github/workflows/generate_github_workflows.py
- 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:
- Edit
.github/workflows/pr-test.yml.j2
- Regenerate workflows:
python .github/workflows/generate_github_workflows.py
- 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
