String result = digest.toString();

        assertNotNull(result);
        assertTrue(result.startsWith("MacSigningKey="));
        assertTrue(result.contains("0102030405060708090A0B0C0D0E0F10"));
    }

    @Test
    @DisplayName("Test writeUTime with zero time")
    void testWriteUTimeWithZeroTime() {
        byte[] dst = new byte[4];