byte[] data = new byte[] { 1, 2 };
            if (mockCtx.supportsIntegrity() && mockCtx.isEstablished()) {
                mockCtx.calculateMIC(data);
            }

            // Verify that calculateMIC was never called
            verify(mockCtx, never()).calculateMIC(any());
            // Verify that supportsIntegrity was checked once
            verify(mockCtx, times(1)).supportsIntegrity();

    }

    @Test
    @DisplayName("calculateMIC returns value from GSS and verifies interaction")
    void calculateMIC_success() throws Exception {
        byte[] data = new byte[] { 1, 2, 3 };
        byte[] mic = new byte[] { 9, 8 };
        when(gssContext.getMIC(eq(data), eq(0), eq(3), any())).thenReturn(mic);

        byte[] res = ctx.calculateMIC(data);
        assertArrayEquals(mic, res);

        verify(this.mechContext, times(1)).dispose();
    }

    @Test
    @DisplayName("calculateMIC throws when context not established")
    void testCalculateMICRequiresEstablished() throws Exception {
        SpnegoContext ctx = newContext();
        CIFSException ex = assertThrows(CIFSException.class, () -> ctx.calculateMIC(new byte[] { 1 }));
        assertEquals("Context is not established", ex.getMessage());

        return this.mechContext.isPreferredMech(mech);
    }

    @Override
    public byte[] calculateMIC(final byte[] data) throws CIFSException {
        if (!this.completed) {
            throw new CIFSException("Context is not established");
        }
        return this.mechContext.calculateMIC(data);
    }

    /**
     * {@inheritDoc}
     *

     * @param data the data to calculate MIC for
     * @return MIC
     * @throws CIFSException if an error occurs calculating the MIC
     */
    byte[] calculateMIC(byte[] data) throws CIFSException;

    /**
     * Verifies a Message Integrity Code (MIC) for the given data.
     * @param data the data to verify
     * @param mic the MIC to verify against

        return true;
    }

    /**
     * {@inheritDoc}
     *
     * @throws CIFSException
     *
     * @see jcifs.smb.SSPContext#calculateMIC(byte[])
     */
    @Override
    public byte[] calculateMIC(byte[] data) throws CIFSException {
        try {
            return this.gssContext.getMIC(data, 0, data.length, new MessageProp(false));
        } catch (GSSException e) {

    }

    @Override
    public boolean isMICAvailable() {
        return !this.auth.isGuest() && this.signKey != null && this.verifyKey != null;
    }

    @Override
    public byte[] calculateMIC(final byte[] data) throws CIFSException {
        final byte[] sk = this.signKey;
        if (sk == null) {
            throw new CIFSException("Signing is not initialized");
        }