SymbolProvider provider = new SingleKeySymbolProvider(InternalConstants.TAPESTRY_APP_PACKAGE_PARAM, appPackage);
TapestryAppInitializer initializer = new TapestryAppInitializer(provider, appName, PageTesterModule.TEST_MODE);
initializer.addModules(PageTesterModule.class);
initializer.addModules(moduleClasses);
initializer.addModules(provideExtraModuleDefs());
_registry = initializer.getRegistry();
_request = _registry.getObject(TestableRequest.class, null);