Blue-Green Deployment Testing
Blue-green deployment testing verifies a release strategy where two identical production environments (blue and green) exist, with live traffic on one while the other receives the new release — testing the new version in isolation before switching traffic over, and enabling near-instant rollback by switching back.
The new version deploys fully to the idle environment (say, green), where it can be smoke-tested and verified against real production infrastructure and configuration — but zero live user traffic — before a router or load balancer switch sends real traffic to it, ideally all at once or gradually.
Testing specifically needs to confirm the switch itself works cleanly: that in-flight requests during the cutover aren't dropped, that both environments can access shared resources (database, cache) consistently, and — critically — that rolling back by switching traffic back to blue actually restores the previous working state without complications.
