testing-patterns

name	testing-patterns
description	Testing strategy: pyramid, AAA, mocks/fakes/stubs, flaky tests, coverage. Triggers: test, fixture, mock, stub, e2e, TDD, Playwright, Cypress, flaky, coverage, property-based.
effort	medium
user-invocable	false
allowed-tools	Read

Testing Patterns Skill

Test Structure (AAA Pattern)

def test_function_does_expected_thing():
    """Test description explaining what and why."""
    # Arrange - Set up test data and preconditions
    input_data = {"key": "value"}
    expected = "result"

    # Act - Execute the code under test
    result = function_under_test(input_data)

    # Assert - Verify the outcome
    assert result == expected

---

Test Organization

tests/
├── conftest.py           # Shared fixtures
├── unit/                 # Unit tests (isolated)
│   ├── test_search_core.py
│   └── test_utils.py
├── integration/          # Integration tests
│   └── test_api.py
└── e2e/                  # End-to-end tests
    └── test_workflow.py