Feature Flag Testing
Feature flag testing verifies that toggling a feature flag correctly enables or disables the associated functionality, that different flag combinations don't produce unexpected interactions, and that flags can be safely turned off in production without requiring a full redeploy if something goes wrong.
Feature flags let teams deploy code before fully releasing it — the code ships to production but stays inactive behind a flag, later enabled for specific users, a percentage of traffic, or everyone at once, decoupling the act of deploying from the act of releasing.
Testing needs to cover flag combinations, not just individual flags in isolation — a bug that only appears when two specific flags are both enabled simultaneously is easy to miss if each flag is only ever tested on its own, and the number of realistic combinations grows quickly as more flags accumulate in a codebase over time.
