test_func_get.go

func TestRouterForNonExistentRoute(t *testing.T) {
	r := newRouter()
	mockServer := httptest.NewServer(r)
	// Most of the code is similar. The only difference is that now we make a
	//request to a route we know we didn't define, like the `POST /hello` route.
	resp, err := http.Post(mockServer.URL+"/hello", "", nil)

	if err != nil {
		t.Fatal(err)
	}

	// We want our status to be 405 (method not allowed)
	if resp.StatusCode != http.StatusMethodNotAllowed {
		t.Errorf("Status should be 405, got %d", resp.StatusCode)
	}

	// The code to test the body is also mostly the same, except this time, we
	// expect an empty body
	defer resp.Body.Close()
	b, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		t.Fatal(err)
	}
	respString := string(b)
	expected := ""

	if respString != expected {
		t.Errorf("Response should be %s, got %s", expected, respString)
	}

}