API Testing Framework

API testing fails when it only covers the happy path — verifying that valid requests return 200 responses with the expected shape. The error conditions, edge cases, and boundary behaviors are exactly what consumer integrations must handle correctly, and those are what most test suites miss. An API test suite that doesn't verify 401 responses, field validation errors, rate limit responses, and concurrent request behavior is leaving the API's contract partially untested.

The API Testing Framework covers the complete response contract — success paths, error conditions, edge cases, and performance behavior — with assertions specific enough to catch regressions before they reach consumers.