feat(challenge7): reorganisation

libs/ngrx-notification/backend/src/index.ts

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+export * from './lib/push.service';

libs/ngrx-notification/backend/src/lib/push.service.ts

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+import {
+  Push,
+  randStudent,
+  randTeacher,
+} from '@angular-challenges/ngrx-notification/model';
+import { Injectable } from '@angular/core';
+import { BehaviorSubject, tap, timer } from 'rxjs';
+
+@Injectable({ providedIn: 'root' })
+export class PushService {
+  private notificationSubject = new BehaviorSubject<Push | undefined>(
+    undefined
+  );
+  notification$ = this.notificationSubject.asObservable();
+
+  init() {
+    this.startTeacherNotification();
+    this.startStudentNotification();
+  }
+
+  private startTeacherNotification() {
+    timer(0, 4000)
+      .pipe(tap(() => this.notificationSubject.next(randTeacher())))
+      .subscribe();
+  }
+
+  private startStudentNotification() {
+    timer(1000, 3000)
+      .pipe(tap(() => this.notificationSubject.next(randStudent())))
+      .subscribe();
+  }
+}

libs/ngrx-notification/backend/src/test-setup.ts

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+import 'jest-preset-angular/setup-jest';