go/src/net/http/httptest/recorder_test.go

func TestRecorder(t *testing.T) { … }

// issue 39017 - disallow Content-Length values such as "+3"
func TestParseContentLength(t *testing.T) { … }

// Ensure that httptest.Recorder panics when given a non-3 digit (XXX)
// status HTTP code. See https://golang.org/issues/45353
func TestRecorderPanicsOnNonXXXStatusCode(t *testing.T) { … }