#vulnerable code 
                                @Test
    public void testItalicWithI()
        throws Exception
    {
        IContext context = null;
        BufferedElement parent = null;

        ITextStylingTransformer formatter = HTMLTextStylingTransformer.INSTANCE;
        IDocumentHandler handler = new DocxDocumentHandler( parent, context, "word/document.xml" );
        formatter.transform( "<i>text</i>", handler );
        Assert.assertEquals( "<w:r><w:rPr><w:i /></w:rPr><w:t xml:space=\"preserve\" >text</w:t></w:r>",
                             handler.getTextBody() );
    } 
                            #location 9 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Test
    public void testItalicWithI()
        throws Exception
    {
        IContext context = new MockContext();
        BufferedElement parent = null;

        ITextStylingTransformer formatter = HTMLTextStylingTransformer.INSTANCE;
        IDocumentHandler handler = new DocxDocumentHandler( parent, context, "word/document.xml" );
        formatter.transform( "<i>text</i>", handler );
        Assert.assertEquals( "<w:r><w:rPr><w:i /></w:rPr><w:t xml:space=\"preserve\" >text</w:t></w:r>",
                             handler.getTextBody() );
    }