@Test
 public void testEscapeSolrQueryFunction() {
   final VariableResolverImpl resolver = new VariableResolverImpl();
   ContextImpl context =
       new ContextImpl(null, resolver, null, Context.FULL_DUMP, Collections.EMPTY_MAP, null, null);
   Context.CURRENT_CONTEXT.set(context);
   try {
     Map m = new HashMap();
     m.put("query", "c:t");
     resolver.addNamespace(
         "dataimporter.functions",
         EvaluatorBag.getFunctionsNamespace(Collections.EMPTY_LIST, null));
     resolver.addNamespace("e", m);
     String s = resolver.replaceTokens("${dataimporter.functions.escapeQueryChars(e.query)}");
     org.junit.Assert.assertEquals("c\\:t", s);
   } finally {
     Context.CURRENT_CONTEXT.remove();
   }
 }