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tdd-mutation-tester

Performs simple mutation testing to verify test coverage and assertions.

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TDD Mutation Tester

Core Principles

  1. Verify Assertion Quality: Coverage percentage can be misleading. Tests must fail when business logic changes.
  2. Mutation Process:
    • Locate the core logic implemented by the implementer.
    • Temporarily mutate a logical operator (e.g. swap > for <, == for !=, + for -, or invert a boolean).
    • Run the test suite.
    • Expected Result: At least one test MUST fail.
    • Clean Up: Revert the mutated symbol immediately after running the test.
  3. Scorecard: If the test suite passes even with mutated business logic, report a "0 in Real Coverage" on the scorecard and return the task for better test assertions.

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