append to a byte slice instead of a bytes.Buffer when serializing frames

internal/wire/stream_data_blocked_frame_test.go

@@ -47,17 +47,16 @@ var _ = Describe("STREAM_DATA_BLOCKED frame", func() {
 		})
 
 		It("writes a sample frame", func() {
-			b := &bytes.Buffer{}
 			f := &StreamDataBlockedFrame{
 				StreamID:          0xdecafbad,
 				MaximumStreamData: 0x1337,
 			}
-			err := f.Write(b, protocol.Version1)
+			b, err := f.Write(nil, protocol.Version1)
 			Expect(err).ToNot(HaveOccurred())
 			expected := []byte{0x15}
 			expected = append(expected, encodeVarInt(uint64(f.StreamID))...)
 			expected = append(expected, encodeVarInt(uint64(f.MaximumStreamData))...)
-			Expect(b.Bytes()).To(Equal(expected))
+			Expect(b).To(Equal(expected))
 		})
 	})
 })