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    <p>httptest does two types of tests: response and server</p> <p>Response test:</p> <pre><code>func TestHeader3D(t *testing.T) { resp := httptest.NewRecorder() uri := "/3D/header/?" path := "/home/test" unlno := "997225821" param := make(url.Values) param["param1"] = []string{path} param["param2"] = []string{unlno} req, err := http.NewRequest("GET", uri+param.Encode(), nil) if err != nil { t.Fatal(err) } http.DefaultServeMux.ServeHTTP(resp, req) if p, err := ioutil.ReadAll(resp.Body); err != nil { t.Fail() } else { if strings.Contains(string(p), "Error") { t.Errorf("header response shouldn't return error: %s", p) } else if !strings.Contains(string(p), `expected result`) { t.Errorf("header response doen't match:\n%s", p) } } } </code></pre> <p>Server test (which is what you need to use):</p> <pre><code>func TestIt(t *testing.T){ ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.Header().Set("Content-Type", "application/json") fmt.Fprintln(w, `{"fake twitter json string"}`) })) defer ts.Close() twitterUrl = ts.URL c := make(chan *twitterResult) go retrieveTweets(c) tweet := &lt;-c if tweet != expected1 { t.Fail() } tweet = &lt;-c if tweet != expected2 { t.Fail() } } </code></pre> <p>BTW, you don't need to pass in the pointer of r, because it's already a pointer. </p> <pre><code>err = json.Unmarshal(body, r) </code></pre> <p>EDIT: for my recorder test, I could use my http handler like this:</p> <pre><code>handler(resp, req) </code></pre> <p>But my original code is not using the default mux (but from Gorilla/mux), and I have some wrapping around the mux, e.g. insert server logging, and adding request context (Gorilla/context), so I had to start from mux and call ServeHTTP</p>
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