public void UntokenizedAnalyzer_lower_cases_and_produces_single_token() {
     var reader = new StringReader("FOO bar");
     var analyzer = new UntokenizedAnalyzer();
     var tokenStream = analyzer.TokenStream("x", reader);
     var first = tokenStream.Next();
     Assert.AreEqual("foo bar", first.Term());
     Assert.IsNull(tokenStream.Next());
 }