英文:
Testing json.Marshal(myType) with typed parameter
问题
我有这个方法
func getRequestBody(object MyType) ([]byte, error) {if object == nil {return nil, nil}requestBody, err := json.Marshal(object)if err != nil {return nil, errors.New("无法将请求体编组为JSON")}return requestBody, nil}
我正在尝试像这样测试该函数：
t.Run("errorMarshaling", func(t *testing.T) {body, err := getRequestBody([某个无法编组的MyType对象])assert.Nil(t, body)assert.Equal(t, err.Error(), "无法将请求体编组为JSON")})
有没有办法在不更改函数属性类型的情况下完成这个测试？
英文:
I have this method
func getRequestBody(object MyType ) ([]byte, error) {if object == nil {return nil, nil}requestBody, err := json.Marshal(object)if err != nil {return nil, errors.New("unable to marshal the request body to json")}return requestBody, nil}
And I'm trying to test the function like this:
t.Run("errorMarshaling", func(t *testing.T) {body, err := getRequestBody([some object of MyType to do the marshal fail])assert.Nil(t, body)assert.Equal(t, err.Error(), "unable to marshal the request body to json")})
Is there any way to do it without changing the function attribute type?
答案1
得分: 2
json.marshall只会在文档中列出的特定情况下抛出错误：
> 无法将通道、复杂类型和函数值编码为JSON。
> 尝试编码此类值会导致Marshal返回UnsupportedTypeError。
>
> JSON无法表示循环数据结构，Marshal也无法处理它们。将循环结构传递给Marshal将导致错误。
如果底层对象无法满足这些条件之一，我认为您将无法使其在测试中失败。
英文:
json.marshall will only throw an error in specific circumstances listed in the documentation:
> Channel, complex, and function values cannot be encoded in JSON.
> Attempting to encode such a value causes Marshal to return an
> UnsupportedTypeError.
>
> JSON cannot represent cyclic data structures and Marshal does not
> handle them. Passing cyclic structures to Marshal will result in an
> error.
If the underlying object doesn't have the ability to meet one of these criteria, I don't think you'll be able to get it to fail in your test.
答案2
得分: 0
最后我改变了我的函数参数
type myTypeBody interface{}func getRequestBody(object myTypeBody) ([]byte, error) {if object == nil {return nil, nil}requestBody, err := json.Marshal(object)if err != nil {return nil, errors.New("无法将请求体编组为 JSON")}return requestBody, nil}
测试部分如下：
t.Run("errorMarshaling", func(t *testing.T) {body, err := getRequestBody(func() {})assert.Nil(t, body)assert.Equal(t, err.Error(), "无法将请求体编组为 JSON")})
英文:
Finally I changed my function parameter
type myTypeBody interface{}func getRequestBody(object myTypeBody ) ([]byte, error) {if object == nil {return nil, nil}requestBody, err := json.Marshal(object)if err != nil {return nil, errors.New("unable to marshal the request body to json")}return requestBody, nil}
And the test
t.Run("errorMarshaling", func(t *testing.T) {body, err := getRequestBody(func() {})assert.Nil(t, body)assert.Equal(t, err.Error(), "unable to marshal the request body to json")})
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