}
    }

    @Test
    void testConstructorWithLongKey() throws NoSuchAlgorithmException {
        // Test constructor with a key longer than BLOCK_LENGTH (64 bytes)
        try (MockedStatic<Crypto> mockedCrypto = mockStatic(Crypto.class)) {
            mockedCrypto.when(Crypto::getMD5).thenReturn(mockMd5);
            HMACT64 hmac = new HMACT64(LONG_TEST_KEY);

    void testConstructorWithLongKey() {
        // Test constructor with a key longer than BLOCK_LENGTH (64 bytes)
        // HMACT64 truncates keys at 64 bytes
        HMACT64 hmac = new HMACT64(LONG_TEST_KEY);
        assertNotNull(hmac);
    }

    @Test
    void testConstructorWithShortKey() {
        // Test constructor with a key shorter than BLOCK_LENGTH (64 bytes)
        HMACT64 hmac = new HMACT64(SHORT_TEST_KEY);