@Mock
    private Configuration mockConfig;

    private static final int TEST_FID = 0x1234;
    private static final byte[] TEST_DATA = "Test pipe data".getBytes(StandardCharsets.UTF_8);
    private static final int TEST_OFFSET = 0;
    private static final int TEST_LENGTH = TEST_DATA.length;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
    }

    @Test

        SecretKeySpec key = new SecretKeySpec(new byte[16], "ARCFOUR");
        byte[] mac = PacMac.calculateMacArcfourHMACMD5(3, key, TEST_DATA);
        assertNotNull(mac);
        assertEquals(16, mac.length);

        // Test with a different key usage
        byte[] mac2 = PacMac.calculateMacArcfourHMACMD5(9, key, TEST_DATA);
        assertNotNull(mac2);
        assertEquals(16, mac2.length);

        // Test with another key usage