Mutation
What it is
Stryker-style. Mutate the code under test (flip booleans, replace operators), verify the existing tests catch the mutation. Proves your tests can catch bugs at all.
When to use it
Suspected over-loose test coverage on critical code.
Example gates
No production gate yet. Stryker integration is a future slice.
See also
- The pyramid — where this mode sits relative to the others
- Writing a gate — how to scaffold a new gate in this mode
- Decision tree — "I just wrote feature X — what tests do I owe?"