英文:
How to verify if a specific function is called
问题
我正在尝试使用Go语言编写TDD（测试驱动开发）代码。然而，我在以下部分遇到了困难。
要编写的测试代码：
func TestFeatureStart(t *testing.T) {}
要测试的实现代码：
func (f *Feature) Start() error {
cmd := exec.Command(f.Cmd)
cmd.Start()
}
如何测试这个简单的代码片段呢？我想我只需要验证exec库是否被正确调用。在Java中，我会使用Mockito来实现这个功能。有人可以帮我编写这个测试吗？根据我所了解的，建议使用接口来实现。
Feature结构体只包含一个字符串Cmd。
英文:
I'm trying my hand at writing TDD in Go. I am however stuck at the following.
The test to write:
func TestFeatureStart(t *testing.T) {}
Implementation to test:
func (f *Feature) Start() error {
cmd := exec.Command(f.Cmd)
cmd.Start()
}
How would one test this simple bit? I figured I only wanted to verify that the exec library is spoken to correctly. That's the way I would do it in Java using Mockito. Can anyone help me write this test? From what I've read the usage of interfaces is suggested.
The Feature-struct only contains a string Cmd.
答案1
得分: 19
你可以通过接口来伪造整个交易，但也可以使用可伪造的函数。在代码中：
var cmdStart = (*exec.Cmd).Start
func (f *Feature) Start() error {
cmd := exec.Command(f.Cmd)
return cmdStart(cmd)
}
在测试中：
called := false
cmdStart = func(*exec.Cmd) error { called = true; return nil }
f.Start()
if !called {
t.Errorf("命令未启动")
}
另请参阅：Andrew Gerrand的Testing Techniques talk。
英文:
You can fake the whole deal with interfaces, but you could also use fakeable functions. In the code:
var cmdStart = (*exec.Cmd).Start
func (f *Feature) Start() error {
cmd := exec.Command(f.Cmd)
return cmdStart(cmd)
}
In the tests:
called := false
cmdStart = func(*exec.Cmd) error { called = true; return nil }
f.Start()
if !called {
t.Errorf("command didn't start")
}
See also: Andrew Gerrand's Testing Techniques talk.
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