if err == nil {
		t.Errorf("Ed25519: unexpected success")
	}
}

// TestSupportedSignatureAlgorithms checks that all supportedSignatureAlgorithms
// have valid type and hash information.
func TestSupportedSignatureAlgorithms(t *testing.T) {
	for _, sigAlg := range supportedSignatureAlgorithms() {
		sigType, hash, err := typeAndHashFromSignatureScheme(sigAlg)
		if err != nil {
			t.Errorf("%v: unexpected error: %v", sigAlg, err)