Add unit tests for AppComponent

src/app/app.spec.ts

@@ -0,0 +1,30 @@
+import { TestBed } from '@angular/core/testing';
+import { RouterTestingModule } from '@angular/router/testing';
+import { App } from './app';
+
+describe('App', () => {
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [App, RouterTestingModule],
+    }).compileComponents();
+  });
+
+  it('should create the app', () => {
+    const fixture = TestBed.createComponent(App);
+    const app = fixture.componentInstance;
+    expect(app).toBeTruthy();
+  });
+
+  it(`should have as title 'daggerverse-test-angular-project'`, () => {
+    const fixture = TestBed.createComponent(App);
+    const app = fixture.componentInstance;
+    expect(app.title()).toEqual('daggerverse-test-angular-project');
+  });
+
+  it('should render title', () => {
+    const fixture = TestBed.createComponent(App);
+    fixture.detectChanges();
+    const compiled = fixture.nativeElement as HTMLElement;
+    expect(compiled.querySelector('h1')?.textContent).toContain('Hello, daggerverse-test-angular-project');
+  });
+});