golang-testing

Table-driven tests in Go organize multiple test cases into a slice of structs, each containing inputs and expected outputs. Define a test table, loop through cases, and run assertions for each. This pattern reduces code duplication and scales test coverage efficiently across scenarios.

Test-driven development in Go starts by writing tests before implementation, using the standard testing package and organizing tests with descriptive names. Use subtests to group related cases, table-driven patterns for multiple scenarios, and run tests with `go test` to validate code as you build.

Subtests organize related test cases hierarchically using `t.Run()`, improving readability and failure isolation. Mark subtests with `t.Parallel()` to run concurrently, reducing total execution time. This approach maintains clean output while accelerating feedback cycles in larger test suites.

Benchmarks measure function performance using the `testing.B` type and `go test -bench` flag, revealing execution time and allocations. Fuzz testing uses `testing.F` to generate random inputs and expose edge cases. Both ensure code remains performant and resilient as projects grow.

Yes. Go's built-in coverage tools generate reports with `go test -cover` to measure code coverage percentage, or `go test -coverprofile` to create detailed profiles. Combine with subtests and table-driven patterns to identify untested paths and maintain reliability across your codebase.

Reliable Go testing requires organizing tests alongside source files with `_test.go` naming, using consistent import paths, and leveraging `go test ./...` to run the full suite. Follow TDD patterns with table-driven and parallel tests to ensure maintainable, fast feedback as codebases scale.