for i := 0; i < cap(c); i++ {
			got = append(got, (<-c)...)
		}
		got = sortBytesInGroups(got, readSize)
		want := bytes.Repeat([]byte(input), count)
		want = sortBytesInGroups(want, readSize)
		if string(got) != string(want) {
			t.Errorf("got: %q; want: %q", got, want)
		}
	})
}

func sortBytesInGroups(b []byte, n int) []byte {
	var groups [][]byte
	for len(b) > 0 {