chore(notification): add unit tests

.github/workflows/test.yml

@@ -28,6 +28,7 @@ jobs:
             storage,
             workers,
             view-transition,
+            notification,
           ]
     name: ${{ matrix.project }}
     steps:

libs/notification/tests/notification.spec.ts

@@ -0,0 +1,59 @@
+import {TestBed} from '@angular/core/testing';
+import {NOTIFICATION_SUPPORT, NotificationService} from '@ng-web-apis/notification';
+import {firstValueFrom} from 'rxjs';
+
+describe('Notification API', () => {
+    describe('if Notification API is not supported', () => {
+        let service: NotificationService;
+
+        beforeEach(() => {
+            TestBed.configureTestingModule({
+                providers: [
+                    {
+                        provide: NOTIFICATION_SUPPORT,
+                        useValue: false,
+                    },
+                    NotificationService,
+                ],
+            });
+
+            service = TestBed.inject(NotificationService);
+        });
+
+        it('method `requestPermission` (from `NotificationService`) returns Observable which fails with error', async () => {
+            await expectAsync(
+                firstValueFrom(service.requestPermission()),
+            ).toBeRejectedWithError('Notification API is not supported in your browser');
+        });
+
+        it('method `open` (from `NotificationService`) returns Observable which fails with error', async () => {
+            await expectAsync(
+                firstValueFrom(service.open('Hello world')),
+            ).toBeRejectedWithError('Notification API is not supported in your browser');
+        });
+    });
+
+    describe('if Notification API is supported', () => {
+        let service: NotificationService;
+        let notificationSupportToken: boolean;
+
+        beforeEach(() => {
+            TestBed.configureTestingModule({
+                providers: [NotificationService],
+            });
+
+            service = TestBed.inject(NotificationService);
+            notificationSupportToken = TestBed.inject(NOTIFICATION_SUPPORT);
+        });
+
+        it('token `NOTIFICATION_SUPPORT` returns true', () => {
+            expect(notificationSupportToken).toBe(true);
+        });
+
+        it('method `requestPermission` (from `NotificationService`) returns `default` permission for the first time', async () => {
+            const permission = await firstValueFrom(service.requestPermission());
+
+            expect(permission).toBe('default');
+        });
+    });
+});