verify(request, times(1)).createCancel();
    }

    @Test
    @DisplayName("Test createCancel returns null when cancel not supported")
    void testCreateCancelReturnsNull() {
        // Given
        when(request.createCancel()).thenReturn(null);

        // When
        CommonServerMessageBlockRequest result = request.createCancel();

        // Then
        assertNull(result);

        return null;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlockRequest#createCancel()
     */
    @Override
    public CommonServerMessageBlockRequest createCancel() {
        return null;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.util.transport.Request#setRequestCredits(int)
     */

        when(request.getNext()).thenReturn(nextRequest);
        when(request.split()).thenReturn(nextRequest);
        when(request.allowChain(nextRequest)).thenReturn(true);
        when(request.createCancel()).thenReturn(nextRequest);
        when(request.size()).thenReturn(1024);
        when(request.getOverrideTimeout()).thenReturn(5000);

        // When & Then
        assertTrue(request.isResponseAsync());

    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlockRequest#createCancel()
     */
    @Override
    public CommonServerMessageBlockRequest createCancel() {
        return new Smb2CancelRequest(getConfig(), getMid(), getAsyncId());
    }

    /**
     * {@inheritDoc}
     *

     */
    int size();

    /**
     * Creates a cancel request for this request.
     *
     * @return create cancel request
     */
    CommonServerMessageBlockRequest createCancel();

    /**
     * Checks if chaining is allowed with the next request.
     *
     * @param next the next request in the chain
     * @return whether to allow chaining
     */

        this.secondaryParameterOffset = NTT_SECONDARY_PARAMETER_OFFSET;
    }

    /**
     *
     * @return a cancel request
     */
    @Override
    public CommonServerMessageBlockRequest createCancel() {
        return new SmbComNtCancel(getConfig(), (int) getMid());
    }

    @Override
    protected int writeParameterWordsWireFormat(final byte[] dst, int dstIndex) {
        final int start = dstIndex;

        return null;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlockRequest#createCancel()
     */
    @Override
    public CommonServerMessageBlockRequest createCancel() {
        return null;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlockResponse#getNextResponse()
     */

            assertNull(testBlock.getNext());
            assertFalse(testBlock.allowChain(mock(CommonServerMessageBlockRequest.class)));
            assertNull(testBlock.split());
            assertNull(testBlock.createCancel());
            assertNull(testBlock.getNextResponse());
            assertFalse(testBlock.isCancel());
            assertEquals(1, testBlock.getCreditCost());
            assertEquals(1, testBlock.getGrantedCredits());