测试案例实例

一、hello

• hello.go

package main

const (
	spanish            = "Spanish"
	french             = "French"
	englishHelloPrefix = "Hello, "
	spanishHelloPrefix = "Hola, "
	frenchHelloPrefix  = "Bonjour, "
)

func main() {
}
func Hello(name, language string) string {
	if name == "" {
		name = "World"
	}
	return greetingPrefix(language) + name
}
func greetingPrefix(language string) (prefix string) {
	switch language {
	case french:
		prefix = frenchHelloPrefix
	case spanish:
		prefix = spanishHelloPrefix
	default:
		prefix = englishHelloPrefix
	}
	return
}

• hello_test.go

package main

import "testing"

func TestHello(t *testing.T) {
	assertCorrectMessage := func(t *testing.T, got, want string) {
		//当测试失败时,报错不会显示真正的错误行数,而是会显示至 调用该辅助函数的位置
		t.Helper() //t.Helper() 需要告诉测试套件这个方法是辅助函数（helper）
		if got != want {
			t.Errorf("got '%q' want '%q'", got, want)
		}
	}
	//为西班牙语用户编写测试
	t.Run("in Spanish", func(t *testing.T) {
		got := Hello("Elodie", "Spanish")
		want := "Hola, Elodie"
		assertCorrectMessage(t, got, want)
	})
	t.Run("saying hello to people", func(t *testing.T) { // t.Run 用于在测试函数内部运行子测试
		got := Hello("Chris", "")
		want := "Hello, Chris"
		assertCorrectMessage(t, got, want)
	})
	t.Run("empty string defaults to 'world'", func(t *testing.T) {
		got := Hello("", "")
		want := "Hello, World"
		assertCorrectMessage(t, got, want)
	})
}