assertDoesNotThrow(() -> SingletonContext.init(props));
        CIFSContext context = SingletonContext.getInstance();
        assertNotNull(context);
        assertEquals("CustomOS", context.getConfig().getNativeOs());
        assertEquals("CustomLanman", context.getConfig().getNativeLanman());
    }

    @Test
    void testInitAlreadyInitializedThrowsException() throws CIFSException {

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

        return dstIndex - start;
    }

    @Override

        return this.nativeLanMan;
    }

    /**
     * Returns the native operating system string reported by the server.
     *
     * @return the nativeOs
     */
    public final String getNativeOs() {
        return this.nativeOs;
    }

    /**
     * Returns the primary domain name of the server.
     *
     * @return the primaryDomain
     */
    public final String getPrimaryDomain() {

            mockConfig.isPort139FailoverEnabled();
            mockConfig.isUseUnicode();
            mockConfig.isForceUnicode();
            mockConfig.isUseBatching();
            mockConfig.getNativeOs();
            mockConfig.getNativeLanman();
            mockConfig.getReceiveBufferSize();
            mockConfig.getSendBufferSize();
            mockConfig.getSoTimeout();
            mockConfig.getConnTimeout();

    }

    @Test
    void writeParameterWordsWithBlob() throws Exception {
        setupNegotiateStubs();
        when(mockConfig.getVcNumber()).thenReturn(0);
        when(mockConfig.getNativeOs()).thenReturn("Test OS");
        when(mockConfig.getNativeLanman()).thenReturn("Test LAN");

        byte[] blob = blobCred();