Go语言教程：单元测试与命令行参数

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func TestHello(t *testing.T) {
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  var name string
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  greeting, err := hello(name)
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  if err == nil {
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    t.Errorf("The error is nil, but it should not be. (name=%q)", name)
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  }
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  if greeting != "" {
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    t.Errorf("Nonempty greeting, but it should not be. (name=%q)", name)
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  }
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  name = "Robert"
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  greeting, err = hello(name)
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  if err != nil {
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    t.Errorf("The error is not nil, but it should be. (name=%q)", name)
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  }
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  if greeting == "" {
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    t.Errorf("Empty greeting, but it should not be. (name=%q)", name)
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  }
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  expected := fmt.Sprintf("Hello, %s!", name)
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  if greeting != expected {
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    t.Errorf("The actual greeting %q is not the expected. (name=%q)", greeting, name)
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  }
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  t.Logf("The expected greeting is %q.\\n", expected)
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}

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func TestIntroduce(t *testing.T) {
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  intro := introduce()
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  expected := "Welcome to my Golang column."
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  if intro != expected {
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    t.Errorf("The actual introduce %q is not the expected.", intro)
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  }
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  t.Logf("The expected introduce is %q.\\n", expected)
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}

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func TestFail(t *testing.T) {
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  //t.Fail()
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  t.FailNow() // 此调用会让当前的测试立即失败。
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  t.Log("Failed.")
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}

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func init() {
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  flag.StringVar(&name, "name", "everyone", "The greeting object.")
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}

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func main() {
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  flag.Parse()
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  greeting, err := hello(name)
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  if err != nil {
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    fmt.Printf("error: %s\\n", err)
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    return
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  }
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  fmt.Println(greeting, introduce())
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}

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func hello(name string) (string, error) {
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  if name == "" {
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    return "", errors.New("empty name")
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  }
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  return fmt.Sprintf("Hello, %s!", name), nil
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}

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func introduce() string {
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  return "Welcome to my Golang column."
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}