Go
Go ships with a built-in testing package that requires no third-party dependencies. The go test command finds and runs tests automatically. You don't need to configure a test runner, register test files, or install plugins. This built-in simplicity is one of Go's strongest
Go
Unit tests verify logic in isolation. Integration tests verify that components work together: your code + database, your service + external API, your handler + middleware stack. Go's testing package supports both, and the patterns for integration testing are as idiomatic as those for unit testing. Separating Integration Tests Mark slow
Go
Go's testing package includes a built-in benchmark system. Benchmarks measure how long code takes to run and how much memory it allocates. They're the right tool for validating optimization work and catching performance regressions. Writing Benchmarks Benchmark functions start with Bench and take *testing.B:
Go
Mocking in Go is interface-based. You define an interface, generate a mock implementation, and use it in tests to control behavior and verify interactions. The two main tools are gomock (from the Google team) and mockery (a third-party code generator). This tutorial covers both. Why Mock? Pure unit