func ExampleResponseRecorder() {
handler := func(w http.ResponseWriter, r *http.Request) {
http.Error(w, "something failed", http.StatusInternalServerError)
}
req, err := http.NewRequest("GET", "http://example.com/foo", nil)
if err != nil {
log.Fatal(err)
}
w := httptest.NewRecorder()
handler(w, req)
fmt.Printf("%d - %s", w.Code, w.Body.String())
// Output: 500 - something failed
}
func TestRecorder(t *testing.T) {
type checkFunc func(*ResponseRecorder) error
check := func(fns ...checkFunc) []checkFunc { return fns }
hasStatus := func(wantCode int) checkFunc {
return func(rec *ResponseRecorder) error {
if rec.Code != wantCode {
return fmt.Errorf("Status = %d; want %d", rec.Code, wantCode)
}
return nil
}
}
hasContents := func(want string) checkFunc {
return func(rec *ResponseRecorder) error {
if rec.Body.String() != want {
return fmt.Errorf("wrote = %q; want %q", rec.Body.String(), want)
}
return nil
}
}
hasFlush := func(want bool) checkFunc {
return func(rec *ResponseRecorder) error {
if rec.Flushed != want {
return fmt.Errorf("Flushed = %v; want %v", rec.Flushed, want)
}
return nil
}
}
tests := []struct {
name string
h func(w http.ResponseWriter, r *http.Request)
checks []checkFunc
}{
{
"200 default",
func(w http.ResponseWriter, r *http.Request) {},
check(hasStatus(200), hasContents("")),
},
{
"first code only",
func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(201)
w.WriteHeader(202)
w.Write([]byte("hi"))
},
check(hasStatus(201), hasContents("hi")),
},
{
"write sends 200",
func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("hi first"))
w.WriteHeader(201)
w.WriteHeader(202)
},
check(hasStatus(200), hasContents("hi first"), hasFlush(false)),
},
{
"flush",
func(w http.ResponseWriter, r *http.Request) {
w.(http.Flusher).Flush() // also sends a 200
w.WriteHeader(201)
},
check(hasStatus(200), hasFlush(true)),
},
}
r, _ := http.NewRequest("GET", "http://foo.com/", nil)
for _, tt := range tests {
h := http.HandlerFunc(tt.h)
rec := NewRecorder()
h.ServeHTTP(rec, r)
for _, check := range tt.checks {
if err := check(rec); err != nil {
t.Errorf("%s: %v", tt.name, err)
}
}
}
}