public void testNestedExpressions() throws PatternException, ComponentException {
String expr = "{request-param:{request-param:foo}}";
MockRequest request = getRequest();
request.reset();
request.addParameter("foo", "bar");
request.addParameter("bar", "123");
InvokeContext context = new InvokeContext(true);
context.enableLogging(new LogKitLogger(getLogger()));
Map sitemapElements = new HashMap();
context.pushMap("sitemap", sitemapElements);