Testing trong Go viết thế nào?

// math_test.go
package math

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)
    }
}

// Table-driven test
func TestMultiply(t *testing.T) {
    tests := []struct {
        name string
        a, b int
        want int
    }{
        {"positive", 3, 4, 12},
        {"zero", 0, 5, 0},
        {"negative", -2, 3, -6},
    }
    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            got := Multiply(tt.a, tt.b)
            if got != tt.want {
                t.Errorf("Multiply(%d, %d) = %d; want %d", tt.a, tt.b, got, tt.want)
            }
        })
    }
}