### Question:
Keys { public static byte[] serialize(ECKeyPair ecKeyPair) { byte[] privateKey = Numeric.toBytesPadded(ecKeyPair.getPrivateKey(), PRIVATE_KEY_SIZE); byte[] publicKey = Numeric.toBytesPadded(ecKeyPair.getPublicKey(), PUBLIC_KEY_SIZE); byte[] result = Arrays.copyOf(privateKey, PRIVATE_KEY_SIZE + PUBLIC_KEY_SIZE); System.arraycopy(publicKey, 0, result, PRIVATE_KEY_SIZE, PUBLIC_KEY_SIZE); return result; } private  Keys(); static ECKeyPair createEcKeyPair(); static String getAddress(ECKeyPair ecKeyPair); static String getAddress(BigInteger publicKey); static String getAddress(String publicKey); static byte[] getAddress(byte[] publicKey); static byte[] serialize(ECKeyPair ecKeyPair); static ECKeyPair deserialize(byte[] input); static boolean verifyAddress(String address); static boolean verifyPrivateKey(String privateKey); static final int ADDRESS_SIZE; static final int ADDRESS_LENGTH_IN_HEX; static final int PRIVATE_KEY_LENGTH_IN_HEX; }### Answer:
@Test public void testSerializeECKey() { assertThat(Keys.serialize(SampleKeys.KEY_PAIR), is(ENCODED)); }