How to use the @stencil/core/testing.TestWindow function in @stencil/core

beforeEach(async () => {
      window = new TestWindow();
      element = await window.load({
        components: [TestingUpdatesAriaProperty],
        html: ''
      });
      await window.flush();
    });

it('today button changed date', async (done) => {
    const window = new TestWindow();
    element = await window.load({
      components: [Calendar],
      html: ''
    });
    window.flush();

    element.addEventListener('onSelect', (e) => {
      try {
        expect(e.detail).toBe(new Date().toDateString());
        done();
      } catch (err) {
        done.fail(err);
      }
    });

    element.querySelector('.c-calendar__today').click();

it(name, async () => {
        const window = new TestWindow();
        element = await window.load({
          components: [Button],
          html
        });
        window.flush();

        expect(element).toMatchSnapshot();
      });
    };

beforeEach(async () => {
      testWindow = new TestWindow();
      element = await testWindow.load({
        components: [MiNavigation],
        html: ""
      });
    });

beforeEach(async () => {
      window = new TestWindow();
      element = await window.load({
        components: [ArkQRCode],
        html: ''
      });
    });

beforeEach(async () => {
      testWindow = new TestWindow();
      element = await testWindow.load({
        components: [QuillComponent],
        html: ''
      });
    });
  });

beforeEach(async () => {
      testWindow = new TestWindow();
      element = await testWindow.load({
        components: [Flex],
        html: ''
      });
    });

beforeEach(async () => {
      testWindow = new TestWindow();
      element = await testWindow.load({
        components: [PhoditHeader],
        html: ''
      });
    });

beforeEach(() => {
        testWindow = new TestWindow();
    });

beforeEach(async () => {
      testWindow = new TestWindow();
      element = await testWindow.load({
        components: [Button],
        html: ''
      });
    });