assertEquals(16, hash2.length, "NT hash should be 16 bytes");
    }

    @Test
    @DisplayName("getNTHash: null password throws NPE with message")
    void testGetNTHash_null() {
        NullPointerException ex = assertThrows(NullPointerException.class, () -> NtlmUtil.getNTHash((String) null));
        assertEquals("Password parameter is required", ex.getMessage());
    }