Code Generation vs Reflection in Go Test Frameworks

Thu, 09 Jul 2026 00:00:00 +0000

Every Go test framework that supports suites needs to solve the same problem: how do you connect a struct full of test methods to the go test runner? The runner only knows about top-level func Test*(t *testing.T) functions. Your suite is a struct with methods. Something has to bridge the gap.

Most frameworks use reflection. gotest uses code generation. This post explains why, and what the code generation pipeline actually does.

Internals on gotest

Code Generation vs Reflection in Go Test Frameworks