ct := DetectContentType(tt.data)
		if ct != tt.contentType {
			t.Errorf("%v: DetectContentType = %q, want %q", tt.desc, ct, tt.contentType)
		}
	}
}

func TestServerContentTypeSniff(t *testing.T) { run(t, testServerContentTypeSniff) }
func testServerContentTypeSniff(t *testing.T, mode testMode) {
	cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
		i, _ := strconv.Atoi(r.FormValue("i"))
		tt := sniffTests[i]