Golang 测试教程

// Hello ...
func Hello() string {
    return "Hello World"
}

// 传统测试
func TestHello(t *testing.T) {
    result := Hello()
    want := "Hello World"
    if result == want {
        t.Logf("Hello() = %v, want %v", result, want)
    } else {
        t.Errorf("Hello() = %v, want %v", result, want)
    }

    want2 := "Hello world"
    if result == want2 {
        t.Logf("Hello() = %v, want %v", result, want)
    } else {
        t.Errorf("Hello() = %v, want %v", result, want)
    }

}

// 表格驱动测试： 使用匿名结构体，逻辑更清晰
func TestHelloWithTable(t *testing.T) {
    tests := []struct {
        name string
        want string
    }{
        // TODO: Add test cases.
        {
            name: "test for hello",
            want: "Hello World",
        },
    }
    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            if got := Hello(); got != tt.want {
                t.Errorf("Hello() = %v, want %v", got, tt.want)
            }
        })
    }
}

// mode one 
go test  //  equal to : go test .  执行当前目录下的测试文件

// mode two 
go test ./..   // 加上路径参数，可以执行指定目录下的测试文件

func ExampleHello() {
    fmt.Println(Hello())
    // Output:
    // Hello World
} 

func TestMain(m *testing.M) {
    fmt.Println("Before ====================")
    code := m.Run()
    fmt.Println("End ====================")
    os.Exit(code)
}

go test -cover

go test -coverprofile=cover.out
go tool cover -html=cover.out -o coverage.html

func TestAdd_Two(t *testing.T) {
    Convey("test add", t, func() {
        Convey("0 + 0", func() {
            So(Add(0, 0), ShouldEqual, 0)
        })
        Convey("-1 + 0", func() {
            So(Add(-1, 0), ShouldEqual, -1)
        })
    })
}

func TestFloatToString_Two(t *testing.T) {
    Convey("test float to string", t, func() {
        Convey("1.0/3.0", func() {
            result := FloatToString(1.0, 3.0)
            So(result, ShouldContainSubstring, "%")
            So(len(result), ShouldEqual, 6)
            So(result, ShouldEqual, "33.33%")
        })
    })

}

goconvey // 启动 web 界面

// 函数
func main() {
    monkey.Patch(fmt.Println, func(a ...interface{}) (n int, err error) {
        s := make([]interface{}, len(a))
        for i, v := range a {
            s[i] = strings.Replace(fmt.Sprint(v), "hell", "*bleep*", -1)
        }
        return fmt.Fprintln(os.Stdout, s...)
    })
    fmt.Println("what the hell?") // what the *bleep*?
}

// 方法
func main() {
    var d *net.Dialer // Has to be a pointer to because `Dial` has a pointer receiver
    monkey.PatchInstanceMethod(reflect.TypeOf(d), "Dial", func(_ *net.Dialer, _, _ string) (net.Conn, error) {
        return nil, fmt.Errorf("no dialing allowed")
    })
    _, err := http.Get("http://google.com")
    fmt.Println(err) // Get http://google.com: no dialing allowed
}

// 过程
guard := Patch(DestroyResource, func(_ string) {
    
})
defer guard.Unpatch()