Writing test for a Gin API using testify results in a 404 HTTP response code

I have attempted to write a test for my Gin API using testify.

Unfortunately, it responds with an unexpected HTTP 404 response code within the test.

When I execute the program I can reach the corresponding interface via curl and browser.

Why are my tests failing ?

Test code:

func (suite *statisticTestSuite) TestGetProjects() {
	suite.T().Log("TestGetAllProjects")

	recorder := httptest.NewRecorder()

	router := gin.Default()

	request, err := http.NewRequest(http.MethodGet, "/api/v1/statistics/projects", nil)
	request.Header = http.Header{"Content-Type": []string{"application/json"}}

	assert.NoError(suite.T(), err)

	router.ServeHTTP(recorder, request)

	data := make(map[string]interface{})
	data["projects"] = 3

	respBody, err := json.Marshal(gin.H{
		"code": 200,
		"msg":  "ok",
		"data": data,
	})

	fmt.Println(recorder.Code)
	fmt.Println(respBody)
}

You create a router without any handle. Add router.GET("/api/v1/statistics/projects", your handleFunc)

or

func TestHandle(t *testing.T) {
    recorder := httptest.NewRecorder()
    c, _ := gin.CreateTestContext(recorder)

    yourHandleFunc(c)

    fmt.Println(recorder.Code)

}