### Question:
VerifyKey { public boolean verify(byte[] message, byte[] signature) { Util.checkLength(signature, SIGNATURE_BYTES); byte[] sigAndMsg = Util.merge(signature, message); byte[] buffer = Util.zeros(sigAndMsg.length); int[] bufferLen = new int[1]; return Util.isValid(sodium().crypto_sign_ed25519_open(buffer, bufferLen, sigAndMsg, sigAndMsg.length, key), "signature was forged or corrupted"); } VerifyKey(byte[] key);  VerifyKey(String key, Encoder encoder); boolean verify(byte[] message, byte[] signature); boolean verify(String message, String signature, Encoder encoder); byte[] toBytes(); @Override String toString();  }### Answer:
@Test public void testVerifyCorrectRawSignature() throws Exception { byte[] rawSignature = HEX.decode(SIGN_SIGNATURE); byte[] rawMessage = HEX.decode(SIGN_MESSAGE); byte[] rawPublicKey = HEX.decode(SIGN_PUBLIC); VerifyKey verifyKey = new VerifyKey(rawPublicKey); assertTrue(verifyKey.verify(rawMessage, rawSignature)); }
@Test public void testVerifyCorrectHexSignature() throws Exception { byte[] rawPublicKey = HEX.decode(SIGN_PUBLIC); VerifyKey verifyKey = new VerifyKey(rawPublicKey); verifyKey.verify(SIGN_MESSAGE, SIGN_SIGNATURE, HEX); assertTrue(verifyKey.verify(SIGN_MESSAGE, SIGN_SIGNATURE, HEX)); }
@Test public void testDetectBadSignature() throws Exception { try { String badSignature = SIGN_SIGNATURE.concat("0000"); VerifyKey verifyKey = new VerifyKey(SIGN_PUBLIC, HEX); verifyKey.verify(SIGN_MESSAGE, badSignature, HEX); fail("Should an exception on bad signatures"); } catch (Exception e) { assertTrue(true); } }
@Test public void testInitializeFromHex() throws Exception { VerifyKey verifyKey = new VerifyKey(SIGN_PUBLIC, HEX); assertTrue(verifyKey.verify(SIGN_MESSAGE, SIGN_SIGNATURE, HEX)); }