fix router tests and create seaparate package ui-tests

scm-ui/ui-tests/enzyme.js

@@ -0,0 +1,12 @@
+import "raf/polyfill";
+import { configure } from "enzyme";
+import Adapter from "enzyme-adapter-react-16";
+
+// Temporary hack to suppress error
+// https://github.com/facebook/create-react-app/issues/3199#issuecomment-345024029
+window.requestAnimationFrame = function(callback) {
+  setTimeout(callback, 0);
+  return 0;
+};
+
+configure({ adapter: new Adapter() });