@Test
@DisplayName("protobufKeyToHexIfEd25519OrNull valid ED25519 key")
public void protobufKeyToHexIfEd25519OrNull_Valid() throws Exception {

    var instr = "0011223344556677889900aabbccddeeff0011223344556677889900aabbccddeeff";
    var input = Key.newBuilder().setEd25519(ByteString.copyFrom(Hex.decodeHex(instr))).build();
    var result = Utility.protobufKeyToHexIfEd25519OrNull(input.toByteArray());
    assertThat(result).isEqualTo(instr);
}