golang-testing

npx skills add mturac/everything-openai-codex --skill golang-testing --agent codex

Same command for any agent — swap --agent for claude-code, cursor, copilot.

# Go Testing Patterns Comprehensive Go testing patterns for writing reliable, maintainable tests following TDD methodology. ## When to Activate - Writing new Go functions or methods - Adding test coverage to existing code - Creating benchmarks for performance-critical code - Implementing fuzz tests for input validation - Following TDD workflow in Go projects ## TDD Workflow for Go ### The RED-GREEN-REFACTOR Cycle ``` RED → Write a failing test first GREEN → Write minimal code to pass the test REFACTOR → Improve code while keeping tests green REPEAT → Continue with next requirement ``` ### Step-by-Step TDD in Go ```go // Step 1: Define the interface/signature // calculator.go package calculator func Add(a, b int) int { panic("not implemented") // Placeholder } // Step 2: Write failing test (RED) // calculator_test.go package calculator import "testing" func TestAdd(t *testing.T) { got := Add(2, 3) want := 5 if got != want { t.Errorf("Add(2, 3) = %d; want %d", got, want) } } // Step 3: Run test - verify FAIL // $ go test // --- FAIL: TestAdd (0.00s) // panic: not implemented // Step 4: Implement minimal code (GREEN) func Add(a, b int) int { return a + b } // Step 5: Run test - verify

Basic coverage
go test -cover ./...
Generate coverage profile
go test -coverprofile=coverage.out ./...
View coverage in browser
go tool cover -html=coverage.out
View coverage by function
go tool cover -func=coverage.out
Coverage with race detection
go test -race -coverprofile=coverage.out ./...