One post tagged with "patterns"

Every Fiber tutorial shows you how to test a single GET handler. Create an app, register a route, call app.Test(), check the status code. Done.

Then you try to test something real — a middleware chain where auth runs before validation, a custom error handler that renders different responses based on content type, a route group with shared state — and the tutorial patterns fall apart. The handler works in isolation but fails when composed. The test passes with a hardcoded body but breaks when you add a request ID middleware that changes the response shape.

Testing Fiber applications well requires patterns that match how Fiber applications actually work: as compositions of handlers, middleware, and configuration that interact in specific ways.