[REF] router: add TestRouter and improve tests

tests/router/TestRouter.ts

@@ -0,0 +1,17 @@
+import { Router } from "../../src/router/Router";
+import { QWeb } from "../../src/qweb/index";
+
+export class TestRouter extends Router {
+  destroy() {
+    window.removeEventListener("popstate", this.checkAndUpdateRoute);
+    delete QWeb.DIRECTIVE_NAMES.routecomponent;
+    QWeb.DIRECTIVES = QWeb.DIRECTIVES.filter(d => d.name !== "routecomponent");
+
+    // remove component defined inroutes
+    for (let key in QWeb.components) {
+      if (key.startsWith("__component__")) {
+        delete QWeb.components[key];
+      }
+    }
+  }
+}