Add initial Angular application structure and components

src/app/app.component.spec.ts

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