for i := 0; i < 1000; i++ {
		h := new(Hash)
		m[h.Sum64()] = struct{}{}
	}
	if len(m) < 900 {
		t.Errorf("empty hash not sufficiently random: got %d, want 1000", len(m))
	}
}

func TestSeededHash(t *testing.T) {
	s := MakeSeed()
	m := map[uint64]struct{}{}
	for i := 0; i < 1000; i++ {
		h := new(Hash)
		h.SetSeed(s)
		m[h.Sum64()] = struct{}{}
	}
	if len(m) != 1 {