Golang Testing

# Go Testing

> This skill provides comprehensive Go testing patterns extending common testing principles with Go-specific idioms.

## Testing Framework

Use the standard `go test` with **table-driven tests** as the primary pattern.

### Table-Driven Tests

The idiomatic Go testing pattern:

```go
func TestValidateEmail(t *testing.T) {
    tests := []struct {
        name    string
        email   string
        wantErr bool
    }{
        {
            name:    "valid email",
            email:   "user@example.com",
            wantErr: false,
        },
        {
            name:    "missing @",
            email:   "userexample.com",
            wantErr: true,
        },
        {
            name:    "empty string",
            email:   "",
            wantErr: true,
        },
    }

    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            err := ValidateEmail(tt.email)
            if (err != nil) != tt.wantErr {
                t.Errorf("ValidateEmail(%q) error = %v, wantErr %v",
                    tt.email, err, tt.wantErr)
            }
        })
    }
}
```

**Benefits:**
- Easy to add new test cases
- Clear test case documentation
- Parallel test execution with `t.Parallel()`
- Isolated subtests with `t.Run()`

## Test Helpers

Use `t.Helper()` to mark helper functions: