go func() {
		pw.Write([]byte("7\r\n1234567"))
	}()
	cr := NewChunkedReader(pr)
	readBuf := make([]byte, 7)
	n, err := cr.Read(readBuf)
	if err != nil {
		t.Fatal(err)
	}
	want := "1234567"
	if n != 7 || string(readBuf) != want {
		t.Fatalf("Read: %v %q; want %d, %q", n, readBuf[:n], len(want), want)
	}
	go func() {
		pw.Write([]byte("xx"))
	}()
	_, err = cr.Read(readBuf)