Go testing patterns including table-driven tests, subtests, benchmarks, fuzzing, and test coverage. Follows TDD methodology with idiomatic Go practices.
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What the file says
# 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)
…
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