public function testDefinitionTuple()
 {
     $masterKey = BIP32::master_key("000102030405060708090a0b0c0d0e0f", "bitcoin", false);
     $this->assertEquals("00000003", BIP32::calc_address_bytes("3", false));
     $this->assertEquals("80000003", BIP32::calc_address_bytes("3", true));
     $this->assertEquals("00000003", BIP32::calc_address_bytes("3'", false));
     $this->assertEquals("80000003", BIP32::calc_address_bytes("3'", true));
     $this->assertEquals(["00000003", "00000003", "00000003", "00000000"], BIP32::get_definition_tuple($masterKey[0], "m/3/3/3"));
     $this->assertEquals(["00000003", "80000003", "00000003", "00000000"], BIP32::get_definition_tuple($masterKey[0], "m/3/3'/3"));
 }