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ensure that a superfluous WriteHeader call panics in httptest

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This commit is contained in:
dmathieu 2024-09-13 10:13:05 +02:00
parent 8a4b439ee6
commit 562ba1c461
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2 changed files with 18 additions and 4 deletions
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1
src/net/http/httptest/recorder.go
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@ -142,6 +142,7 @@ func checkWriteHeaderCode(code int) {
// WriteHeader implements [http.ResponseWriter].
func (rw *ResponseRecorder) WriteHeader(code int) {
if rw.wroteHeader {
panic(fmt.Sprintf("superfluous response.WriteHeader call"))
return
}

21
src/net/http/httptest/recorder_test.go
View File

@ -138,7 +138,6 @@ func TestRecorder(t *testing.T) {
"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")),
@ -147,8 +146,6 @@ func TestRecorder(t *testing.T) {
"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)),
},
@ -168,7 +165,6 @@ func TestRecorder(t *testing.T) {
"flush",
func(w http.ResponseWriter, r *http.Request) {
w.(http.Flusher).Flush() // also sends a 200
w.WriteHeader(201)
},
check(hasStatus(200), hasFlush(true), hasContentLength(-1)),
},
@ -369,3 +365,20 @@ func TestRecorderPanicsOnNonXXXStatusCode(t *testing.T) {
})
}
}
// Ensure that httptest.Recorder panics when using WriteHeader twice.
func TestRecorderPanicsOnSuperfluousWriteHeader(t *testing.T) {
defer func() {
if r := recover(); r == nil {
t.Fatal("Expected a panic")
}
}()
handler := func(rw http.ResponseWriter, _ *http.Request) {
rw.WriteHeader(200)
rw.WriteHeader(201)
}
r, _ := http.NewRequest("GET", "http://example.org/", nil)
rw := NewRecorder()
handler(rw, r)
}