go-test

Go TDD Command

This command enforces test-driven development methodology for Go code using idiomatic Go testing patterns.

What This Command Does

1. Define Types/Interfaces: Scaffold function signatures first
2. Write Table-Driven Tests: Create comprehensive test cases (RED)
3. Run Tests: Verify tests fail for the right reason
4. Implement Code: Write minimal code to pass (GREEN)
5. Refactor: Improve while keeping tests green
6. Check Coverage: Ensure 80%+ coverage

When to Use

Use /go-test when:

• Implementing new Go functions
• Adding test coverage to existing code
• Fixing bugs (write failing test first)
• Building critical business logic
• Learning TDD workflow in Go

TDD Cycle

RED     → Write failing table-driven test
GREEN   → Implement minimal code to pass
REFACTOR → Improve code, tests stay green
REPEAT  → Next test case

Example Session

User: /go-test I need a function to validate email addresses

Agent:
# TDD Session: Email Validator

## Step 1: Define Interface

```go
// validator/email.go
package validator

// ValidateEmail checks if the given string is a valid email address.
// Returns nil if valid, error describing the issue otherwise.
func ValidateEmail(email string) error {
    panic("not implemented")
}
```

## Step 2: Write Table-Driven Tests (RED)

```go
// validator/email_test.go
package validator

import (
    "testing"
)

func TestValidateEmail(t *testing.T) {
    tests := []struct {
        name    string
        email   string
        wantErr bool
    }{
        // Valid emails
        {"simple email", "[email protected]", false},
        {"with subdomain", "[email protected]", false},
        {"with plus", "[email protected]", false},
        {"with dots", "[email protected]", false},

        // Invalid emails
        {"empty string", "", true},
        {"no at sign", "userexample.com", true},
        {"no domain", "user@", true},
        {"no local part", "@example.com", true},
        {"double at", "user@@example.com", true},
        {"spaces", "user @example.com", true},
        {"no tld", "user@example", true},
    }