Testing middleware


I am trying to test middleware below but code coverage is always 0 although the test passes. What am I missing?


func Timing(next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		timer := time.Now()
		next.ServeHTTP(w, r)

		if ID, ok := r.Context().Value("something"); ok {
func TestTiming(t *testing.T) {
	timingHandler := func(w http.ResponseWriter, r *http.Request) {
		r.WithContext(context.WithValue(r.Context(), "something", "hello"))

	req := httptest.NewRequest(http.MethodGet, "http://www.example.com", nil)
	res := httptest.NewRecorder()
	timingHandler(res, req)

	tim := Timing(timingHandler)
	tim.ServeHTTP(res, req)

	assert.Equal(t, http.StatusOK, res.Result().StatusCode)
1 Like

Sorry, false alarm! The test is actually working fine. Leaving it here just in case if someone needs such thing.

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