fix(router): throw a better error message when angular 1 is not bootstraped

modules/@angular/router/test/router.spec.ts

@@ -7,7 +7,7 @@
  */
 
 import {Location} from '@angular/common';
-import {TestBed} from '@angular/core/testing';
+import {TestBed, inject} from '@angular/core/testing';
 
 import {ResolveData} from '../src/config';
 import {PreActivation, Router} from '../src/router';
@@ -36,10 +36,7 @@ describe('Router', () => {
   describe('setUpLocationChangeListener', () => {
     beforeEach(() => { TestBed.configureTestingModule({imports: [RouterTestingModule]}); });
 
-    it('should be indempotent', () => {
-      const r: Router = TestBed.get(Router);
-      const location: Location = TestBed.get(Location);
-
+    it('should be indempotent', inject([Router, Location], (r: Router, location: Location) => {
          r.setUpLocationChangeListener();
          const a = (<any>r).locationSubscription;
          r.setUpLocationChangeListener();
@@ -52,7 +49,7 @@ describe('Router', () => {
          const c = (<any>r).locationSubscription;
 
          expect(c).not.toBe(b);
-    });
+       }));
   });
 
   describe('PreActivation', () => {

modules/@angular/router/upgrade.ts

@@ -40,10 +40,20 @@ export const RouterUpgradeInitializer = {
   deps: [UpgradeModule, ApplicationRef, RouterPreloader, ROUTER_CONFIGURATION]
 };
 
+/**
+ * @internal
+ */
 export function initialRouterNavigation(
     ngUpgrade: UpgradeModule, ref: ApplicationRef, preloader: RouterPreloader,
     opts: ExtraOptions): Function {
   return () => {
+    if (!ngUpgrade.$injector) {
+      throw new Error(`
+        RouterUpgradeInitializer can be used only after UpgradeModule.bootstrap has been called.
+        Remove RouterUpgradeInitializer and call setUpLocationSync after UpgradeModule.bootstrap.
+      `);
+    }
+
     const router = ngUpgrade.injector.get(Router);
     const ref = ngUpgrade.injector.get(ApplicationRef);
 
@@ -52,17 +62,28 @@ export function initialRouterNavigation(
     if (opts.initialNavigation === false) {
       router.setUpLocationChangeListener();
     } else {
-      setTimeout(() => { router.initialNavigation(); }, 0);
+      router.initialNavigation();
     }
 
-    // History.pushState does not fire onPopState, so the angular2 location
-    // doesn't detect it. The workaround is to attach a location change listener
-    // that will call navigate directly.
+    setUpLocationSync(ngUpgrade);
+  };
+}
+
+/**
+ * @whatItDoes Sets up a location synchronization.
+ *
+ * History.pushState does not fire onPopState, so the angular2 location
+ * doesn't detect it. The workaround is to attach a location change listener
+ *
+ * @experimental
+ */
+export function setUpLocationSync(ngUpgrade: UpgradeModule): void {
+  const router: Router = ngUpgrade.injector.get(Router);
+  const url = document.createElement('a');
+
   ngUpgrade.$injector.get('$rootScope')
       .$on('$locationChangeStart', (_: any, next: string, __: string) => {
-          const url = document.createElement('a');
         url.href = next;
         router.navigateByUrl(url.pathname);
       });
-  };
 }