Test Tetrahedron?

Fig. 1. Animation of a tetrahedron. Source: http://platonicsolids.info/Animated_GIFs/Tetrahedron.GIF
Fig. 2. The net of a tetrahedron. Adapted from: https://www.mathsisfun.com/geometry/images/tetrahedron-net.gif
Fig. 3. Test Tetrahedron (handwritten graph) with the three tiers and the four properties.
Fig. 4. Composite of tetrahedra (source: http://platonicsolids.info/Animated_GIFs/Tetrahedron-Tetrahedron.GIF)
// app.component.spec.ts
it('should render title in a h1 tag', () => {
const fixture = TestBed.createComponent(AppComponent);
fixture.detectChanges();
const compiled = fixture.debugElement.nativeElement;
expect(compiled.querySelector('h1').textContent).toContain('Welcome to test-e2e-app!');
});
// app.po.ts
getTitleText() {return element(by.css('app-root h1')).getText() as Promise<string>;}
// app.e2e-spec.ts
it('should display welcome message', () => {
page.navigateTo();
expect(page.getTitleText()).toEqual('Welcome to test-e2e-app!');
});

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