I'd been shipping fixes to my MCP failure library for weeks. Every release felt solid. Then I've written one real integration test - and three "fixed" bugs weren't fixed at all.
Source: [Dev.to](https://dev.to/chenyuan20509/i-wrote-integration-tests-for-my-mcp-failure-library-heres-the-pattern-that-caught-3-hidden-bugs-1mj2)