fix(service-worker): add missing annotation for SwPush (#19721)

PR Close #19721

packages/service-worker/src/push.ts

@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {Injectable} from '@angular/core';
 import {Observable} from 'rxjs/Observable';
 import {Subject} from 'rxjs/Subject';
 
@@ -23,6 +24,7 @@ import {NgswCommChannel} from './low_level';
  *
  * @experimental
  */
+@Injectable()
 export class SwPush {
   readonly messages: Observable<object>;
   readonly subscription: Observable<PushSubscription|null>;
@@ -79,4 +81,4 @@ export class SwPush {
     const unsubscribeOnce = op_take.call(unsubscribe, 1);
     return op_toPromise.call(unsubscribeOnce) as Promise<void>;
   }
-}
+}

packages/service-worker/test/comm_spec.ts

@@ -7,6 +7,7 @@
  */
 
 import 'rxjs/add/operator/toPromise';
+import {TestBed} from '@angular/core/testing';
 
 import {NgswCommChannel} from '../src/low_level';
 import {SwPush} from '../src/push';
@@ -41,7 +42,7 @@ export function main() {
         mock.setupSw();
       });
     });
-    describe('NgswPush', () => {
+    describe('SwPush', () => {
       let push: SwPush;
       let reg: MockServiceWorkerRegistration;
       beforeEach((done: DoneFn) => {
@@ -63,8 +64,17 @@ export function main() {
           },
         });
       });
+      it('is injectable', () => {
+        TestBed.configureTestingModule({
+          providers: [
+            SwPush,
+            {provide: NgswCommChannel, useValue: comm},
+          ]
+        });
+        expect(() => TestBed.get(SwPush)).not.toThrow();
+      });
     });
-    describe('NgswUpdate', () => {
+    describe('SwUpdate', () => {
       let update: SwUpdate;
       let reg: MockServiceWorkerRegistration;
       beforeEach((done: DoneFn) => {
@@ -132,6 +142,15 @@ export function main() {
             .then(() => done())
             .catch(err => done.fail(err));
       });
+      it('is injectable', () => {
+        TestBed.configureTestingModule({
+          providers: [
+            SwUpdate,
+            {provide: NgswCommChannel, useValue: comm},
+          ]
+        });
+        expect(() => TestBed.get(SwUpdate)).not.toThrow();
+      });
     });
   });
 }