测试接口实现

由于 Go 使用隐式接口实现，如果你的结构没有实现你打算实现的接口，则不会出现编译时错误。你可以使用类型转换显式测试实现：type MyInterface interface {Thing()}

type MyImplementer struct {}

func (m MyImplementer) Thing() {
    fmt.Println("Huzzah!")
}

// Interface is implemented, no error. Variable name _ causes value to be ignored.
var _ MyInterface = (*MyImplementer)nil

type MyNonImplementer struct {}

// Compile-time error - cannot case because interface is not implemented.
var _ MyInterface = (*MyNonImplementer)nil