[Test]
        public void testIgnoreCase()
        {
            IResourceLoader loader = new ClasspathResourceLoader(typeof(TestAnalyzers));
            CommonGramsFilterFactory factory =
                (CommonGramsFilterFactory)
                TokenFilterFactory("CommonGrams", TEST_VERSION_CURRENT, loader, "ignoreCase", "true");
            CharArraySet words = factory.CommonWords;
            assertTrue("words is null and it shouldn't be", words != null);
            assertTrue(words.contains("the")); //passes
            assertTrue(words.contains("The")); //fails
            Tokenizer tokenizer = new MockTokenizer(new StringReader("testing the factory"),MockTokenizer.WHITESPACE, false);
            TokenStream stream = factory.Create(tokenizer);
            AssertTokenStreamContents(
                stream, new String[] {"testing", "testing_The", "The", "The_factory", "factory"});
        }