byte[] first = impl.getBuffer(); // should return slot 0 -> a
        byte[] second = impl.getBuffer(); // then slot 1 -> c
        byte[] third = impl.getBuffer(); // cache empty -> new with size 3

        assertSame(a, first, "First get should return first cached buffer");
        assertSame(c, second, "Second get should return second cached buffer");
        assertNotSame(d, third, "Third get should allocate a new buffer (not the dropped one)");

        long decoded = Encdec.dec_uint64le(buffer, 0);

        // Then
        assertEquals(currentDate.getTime(), decoded, "Encoded and decoded time should match");
    }

    @Test
    @DisplayName("Should encode and decode UUIDs")
    void testUUIDOperations() {
        // Given

  public void testPutIfAbsent_replacesNullValue() {
    initMapWithNullValue();

    // putIfAbsent should replace the null value with the new value
    assertNull(
        "putIfAbsent(existingKeyWithNullValue, value) should return null",
        getMap().putIfAbsent(getKeyForNullValue(), v3()));
    assertEquals("Map should now contain the new value", v3(), getMap().get(getKeyForNullValue()));
  }

    assertEquals("Should be able to peek() at first element", "A", peekingIterator.peek());
    assertEquals(
        "Should be able to peek() first element multiple times", "A", peekingIterator.peek());
    assertEquals(
        "next() should still return first element after peeking", "A", peekingIterator.next());

    assertEquals("Should be able to peek() at middle element", "B", peekingIterator.peek());

        d.readBytesWireFormat(buf, 0);

        // After a full read both flags should be set and hasMore should be false
        assertTrue(d.getParametersDone(), "parametersDone should be true after reading");
        assertTrue(d.getDataDone(), "dataDone should be true after reading");
        assertFalse(d.getHasMore(), "hasMore should be false when both packets are fully read");
    }

    /**

    }

    @Test
    @DisplayName("addFlags0 combines flags correctly")
    void addFlags0() {
        SmbComNTCreateAndX req = createRequest(0, 0);
        req.addFlags0(0x10);
        int flags0 = (int) getPrivateField(req, "flags0");
        assertTrue((flags0 & 0x10) != 0, "flag should be set after addFlags0");
        // Calling again should combine rather than overwrite

        assertEquals(SmbConstants.O_RDONLY, SmbPipeResource.PIPE_TYPE_RDONLY, "PIPE_TYPE_RDONLY should match SmbConstants.O_RDONLY");
    }

    /**
     * Test if the PIPE_TYPE_WRONLY constant has the correct value.
     */
    @Test
    void testPipeTypeWronly() {
        assertEquals(SmbConstants.O_WRONLY, SmbPipeResource.PIPE_TYPE_WRONLY, "PIPE_TYPE_WRONLY should match SmbConstants.O_WRONLY");
    }

    /**

        AvChannelBindings avChannelBindings = new AvChannelBindings(testHash);

        assertEquals(AvPair.MsvAvChannelBindings, avChannelBindings.getType(), "Type should be MsvAvChannelBindings");
        assertArrayEquals(testHash, avChannelBindings.getRaw(), "Value should match the provided hash");
    }

    /**
     * Test that the constructor handles a null channel binding hash.
     */
    @Test

    void testGetPath() {
        // Given
        String path = "/test/path";
        when(mockReferralData.getPath()).thenReturn(path);

        // When
        String result = mockReferralData.getPath();

        // Then
        assertEquals(path, result);
        verify(mockReferralData).getPath();
    }

    @Test
    @DisplayName("Should get expiration")
    void testGetExpiration() {

            // -1 as unsigned short should be 65535
            assertEquals((short) -1, bb.getShort());
            assertEquals(65535, Short.toUnsignedInt((short) -1));
        }
    }

    @Nested
    @DisplayName("Integration Tests with SMBUtil")
    class SMBUtilIntegrationTests {

        @Test
        @DisplayName("Should use SMBUtil.writeInt2 for referral level")