我正在嘗試測試以下功能：// SendRequestAsync sends request asynchronously, accepts callback// func, which it invokes//// Parameters:// - `context` : some context// - `token` : some token// - `apiURL` : the URL to hit// - `callType` : the type of request to make. This should be one of// the HTTP verbs (`"GET"`, `"POST"`, `"PUT"`, `"DELETE"`, ...)// - `callBack` : the func to invoke upon completion// - `callBackCustomData`: the data to invoke `callBack` with//// Since this is an async request, it doesn't return anything.func (a *APICoreSt) SendRequestAsync(context interface{}, token string, apiURL string, callType APIType, header map[string]string, jsonBody []byte, callBack OnCompletion, callBackCustomData interface{}) { go func(data interface{}) { callBack(a.SendRequest(context, token, apiURL, callType, header, jsonBody), data) }(callBackCustomData)}其中OnCompletion定義為：type OnCompletion func(result CallResultSt, data interface{})我立刻想到創建一個間諜回調。為此，我分叉了這個框架，提出了以下內容：// outside the test functiontype MySpy struct { *spies.Spy}func (my *MySpy) Callback(res CallResultSt, data interface{}) { my.Called(res, data) fmt.Println("Hello world") return}//in the test functionspy := new(MySpy)//...some table-driven test logic the generator came up with, containing my dataspy.MatchMethod("Callback", spies.AnyArgs)assert.NotEmpty(t, spies.CallsTo("Callback"))它向我打招呼panic: runtime error: invalid memory address or nil pointer dereference [recovered] panic: runtime error: invalid memory address or nil pointer dereference我該如何解決這個問題，并測試這個方法？
1 回答
喵喔喔
TA貢獻1735條經驗 獲得超5個贊
我會放棄間諜的東西。此任務非常簡單，您不需要外部依賴項來處理它。您可以改為制作自己的“間諜”，它有一個通道，它在調用函數時將 args 傳遞到其中。在您的測試中，您然后嘗試從頻道接收。這將強制測試等待回調函數被調用。您還可以考慮添加一個超時時間，這樣測試就可以失敗，而不是在函數從未被調用時永遠阻塞。
// outside the test function
type MySpy struct {
Args chan MySpyArgs
}
type MySpyArgs struct {
Res CallResultSt
Data interface{}
}
func (my *MySpy) Callback(res CallResultSt, data interface{}) {
my.Args <- MySpyArgs{Res: res, Data: data}
}
//in the test function
spyChan := make(chan MySpyArgs)
spy := &MySpy{spyChan}
//...some table-driven test logic the generator came up with, containing my data
args := <-spyChan
// can now assert arguments were as you expected, etc.
一個粗略的工作示例：https ://play.golang.org/p/zUYpjXdkz-4 。
如果你想使用超時：
...
select {
case args := <-spyChan:
// assertions on args
case <-time.After(5 * time.Second):
// prevent blocking for over 5 seconds and probably fail the test
}
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