Error on testing Gingko and Gomega for gingonic, w.Code not working

Question

I have some tests written in Ginkgo that check the return-code, a 502 code should be returned at a specific moment in time, it returns 502 (as you can see on the logs) but the w.Code is still 200.

[GIN] 2024/02/06 - 19:08:01 | 502 |   62.918958ms |                 | PUT      "/v1/create-user"
200

the code that generated that output is the gin router and this fmt.Printf statement:

(test-code)

req, err := http.NewRequest(http.MethodPut, "/v1/create-user", bytes.NewReader(body))
Expect(err).NotTo(HaveOccurred())
req.Header.Set("Content-Type", "application/json")

router.ServeHTTP(w, req)
fmt.Println(w.Code)      // <- this generated the "200"
Ω(w.Code).Should(Equal(502))

as you can see, the request returned 502, but the w.Code still equals 200. Has any one else had this before? Couldn't find aything online.

Answer 1

Ok, i found some stuff:

• https://github.com/gin-gonic/gin/issues/1120

But I also found out a solution:

It looks like the "error" is with Go's httptest.ResponseRecorder. It seems that it can only be written once. In my test-suite, the first test is expected to return 200 OK, so it sets that value in the response recorder.

This seemed to fix the issue:

req, err := http.NewRequest(http.MethodPut, "/v1/create-user", bytes.NewReader(body))
Expect(err).NotTo(HaveOccurred())
req.Header.Set("Content-Type", "application/json")

w := httptest.NewRecorder()  // <- creates a new response recorder

router.ServeHTTP(w, req)
Ω(w.Code).Should(Equal(http.StatusBadGateway))

This way the test runs successfully.

Note that i am NOT using gin.CreateTestContext().