How to Mock gin.Context with BindJSON for Go Testing?

How to Set Mock gin.Context for BindJSON

When working with Go and Gin framework, setting up a mock gin.Context for testing purposes can be challenging, especially when it involves using BindJSON.

The Problem:

You aim to test MySQL insert logic involving BindJSON, but you can't successfully set up the mock gin.Context required for the test.

The Solution:

To properly set up a mock gin.Context, follow these steps:

1. Instantiate a test gin.Context and ensure its http.Request is non-nil:

w := httptest.NewRecorder()
c, _ := gin.CreateTestContext(w)
c.Request = &http.Request{
    Header: make(http.Header),
}

2. Mock a POST JSON body using the MockJsonPost function:

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))
}

You can now supply the interface{} content argument with data that can be marshalled into JSON, typically a struct with the appropriate JSON tags or a map[string]interface{}.

Example Usage:

func TestMyHandler(t *testing.T) {
    w := httptest.NewRecorder()
    ctx, _ := gin.CreateTestContext(w)
    ctx.Request = &http.Request{
        Header: make(http.Header),
    }

    MockJsonPost(ctx, map[string]interface{}{"foo": "bar"})

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

By creating a mock gin.Context and injecting JSON data into the request, you can effectively test your BindJSON logic in isolation.

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