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

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

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

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

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

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

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

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

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

it('should render content', async () => {
      testWindow = new TestWindow();
      element = await testWindow.load({
        components: [Infowindow],
        html: `
          
            Hello there!
          
        `
      });

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

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

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

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

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

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

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

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

beforeEach(async () => {
      testWindow = new TestWindow();
      element = await testWindow.load({
        components: [ResponsiveContent],
        html: `${domExample}`
      });

      await testWindow.flush();
    });