// should use github.com/hdevalence/ed25519consensus.
//
// See https://hdevalence.ca/blog/2020-10-04-its-25519am for more details.
func TestEd25519Vectors(t *testing.T) {
	jsonVectors := downloadEd25519Vectors(t)
	var vectors []struct {
		A, R, S, M string
		Flags      []string
	}
	if err := json.Unmarshal(jsonVectors, &vectors); err != nil {
		t.Fatal(err)
	}
	for i, v := range vectors {