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computer-playbook/docs/contributing/code/tests/unit.md
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kevinveenbirkenbachandClaude Sonnet 4.6 2457d0e13c docs(playwright): add recording section and remove duplicated requirements
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- Extend Development Procedure to include optional recording step

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-30 10:55:19 +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, 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.