How to Effectively Mock gin.Context's BindJSON in Go Unit Tests?

How to Mock Gin.Context for BindJSON

When testing Go code that uses the Gin framework and requires mocking the gin.Context for BindJSON functionality, it's essential to ensure that:

1. Create a Gin Test Context: Instantiate a test gin.Context and set its *http.Request to a non-nil value.

w := httptest.NewRecorder()
c, _ := gin.CreateTestContext(w)

c.Request = &http.Request{
    Header: make(http.Header),
}

2. Mock the POST JSON Body: Utilize the MockJsonPost function to mimic a POST request with a JSON body.

func MockJsonPost(c *gin.Context, content interface{}) {
    c.Request.Method = "POST"
    c.Request.Header.Set("Content-Type", "application/json")

    jsonbytes, err := json.Marshal(content)
    if err != nil {
        panic(err)
    }

    c.Request.Body = io.NopCloser(bytes.NewBuffer(jsonbytes))
}

The content argument can be any marshalable data structure or map.

Example:

func TestPostImageToDBDao(t *testing.T) {
    w := httptest.NewRecorder()
    ctx, _ := gin.CreateTestContext(w) 

    ctx.Request = &http.Request{
        Header: make(http.Header),
    }

    MockJsonPost(ctx, map[string]interface{}{
        "articleUUID": "bea1b24d-0627-4ea0-aa2b-8af4c6c2a41c",
        "imageNames":  "b8119536-fad5-4ffa-ab71-2f96cca19697",
    })

    PostImageToDBDao(ctx)
    assert.EqualValues(t, http.StatusOK, w.Code)
}

Related Resources:

• [How to unit test a Go Gin handler function?](https://stackoverflow.com/questions/52336566/how-to-unit-test-a-go-gin-handler-function)

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