adder.spec.ts

beforeEach(async () => {
  testWindow = new TestWindow();
  element = await testWindow.load({
    components: [Adder],
    // Let's say we want to props `a` and `b`
    html: '<adder a="2" b="2"></adder>',
  });
});

it('adds up the two values and display it in the text content', () => {
  expect(element.textContent).toEqual('4');
});