super(config, andx);
    }

    /**
     * Returns the native LAN Manager string reported by the server.
     *
     * @return the nativeLanMan
     */
    public final String getNativeLanMan() {
        return this.nativeLanMan;
    }

    /**
     * Returns the native operating system string reported by the server.
     *
     * @return the nativeOs
     */

            dstIndex += writeString(this.primaryDomain, dst, dstIndex);
        }
        dstIndex += writeString(getConfig().getNativeOs(), dst, dstIndex);
        dstIndex += writeString(getConfig().getNativeLanman(), dst, dstIndex);

        return dstIndex - start;
    }

    @Override
    protected int readParameterWordsWireFormat(final byte[] buffer, final int bufferIndex) {
        return 0;
    }

            mockConfig.isUseUnicode();
            mockConfig.isForceUnicode();
            mockConfig.isUseBatching();
            mockConfig.getNativeOs();
            mockConfig.getNativeLanman();
            mockConfig.getReceiveBufferSize();
            mockConfig.getSendBufferSize();
            mockConfig.getSoTimeout();
            mockConfig.getConnTimeout();
            mockConfig.getSessionTimeout();

        setupNegotiateStubs();
        when(mockConfig.getVcNumber()).thenReturn(0);
        when(mockConfig.getNativeOs()).thenReturn("Test OS");
        when(mockConfig.getNativeLanman()).thenReturn("Test LAN");

        byte[] blob = blobCred();
        SmbComSessionSetupAndX obj = new SmbComSessionSetupAndX(mockContext, mockNegotiate, mockAndX, blob);
        byte[] buf = new byte[256];

        CIFSContext context = SingletonContext.getInstance();
        assertNotNull(context);
        assertEquals("CustomOS", context.getConfig().getNativeOs());
        assertEquals("CustomLanman", context.getConfig().getNativeLanman());
    }

    @Test
    void testInitAlreadyInitializedThrowsException() throws CIFSException {
        // Test attempting to initialize when already initialized
        SingletonContext.init(null);