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computer-playbook/docs/contributing/actions/testing/unit.md
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Environment TestandClaude Sonnet 4.6 83262816a3 docs(contributing): apply documentation.md rules across all staged files
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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-10 21:06:17 +02:00

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# Unit Tests 🧪
This page is the SPOT for unit testing requirements, framework, and structure.
Run unit tests with `make test-unit`.
## Framework 🧰
- You MUST use Python `unittest` as the test framework.
- Tests MUST live under `tests/unit/`.
- Mirror the source tree: a file at `plugins/lookup/service.py` gets its tests at `tests/unit/plugins/lookup/test_service.py`.
## Requirements 📋
- You MUST add or update unit tests for every `*.py` file you touch.
- Each test MUST cover one isolated behavior. Do not test multiple concerns in a single test method.
- You MUST NOT write tests that only assert a file contains a string.
- You MUST NOT write tests for non-executable files such as `.yml` or `.j2`. Test the code that consumes them instead.
- You SHOULD name test methods after the behavior they verify, not the function name alone (e.g. `test_needed_false_when_disabled`).
- You SHOULD cover edge cases: empty inputs, missing keys, and boundary values, not only the happy path.
- You MAY use `unittest.mock` to isolate the unit under test from Ansible internals or external state.
## How to Create 🛠️
1. Identify the module under test (e.g. `plugins/lookup/service.py`).
2. Create the matching test file under `tests/unit/` if it does not exist.
3. Subclass `unittest.TestCase`.
4. Write one method per behavior. Build hypotheses before writing assertions.
5. Run `make test-unit` and verify all tests pass.
## Running Specific Tests 🏃
Use `TEST_PATTERN` to scope the test run to a single file or a glob:
```bash
# Run a single test file
TEST_PATTERN=test_my_module.py make test-unit
# Run all files matching a prefix
TEST_PATTERN=test_applications*.py make test-unit
```