infra-sk/modules/expandable-textarea-sk/expandable-textarea-sk_puppeteer_test.ts

import * as path from 'path';
import { expect } from 'chai';
import {
  inBazel,
  loadCachedTestBed,
  takeScreenshot,
  TestBed
} from '../../../puppeteer-tests/util';

describe('expandable-textarea-sk', () => {
  let testBed: TestBed;

  before(async () => {
    testBed = await loadCachedTestBed(
        path.join(__dirname, '..', '..', 'webpack.config.ts')
    );
  });

  beforeEach(async () => {
    await testBed.page.goto(inBazel() ? testBed.baseUrl : `${testBed.baseUrl}/expandable-textarea-sk.html`);
    await testBed.page.setViewport({ width: 400, height: 500 });
  });

  it('should render the demo page', async () => {
    // Smoke test.
    expect(await testBed.page.$$('expandable-textarea-sk')).to.have.length(1);
  });

  describe('screenshots', () => {
    it('shows the closed view', async () => {
      await takeScreenshot(testBed.page, 'infra-sk', 'expandable-textarea-sk_closed');
    });

    it('shows the expanded view', async () => {
      await testBed.page.click('button');
      await takeScreenshot(testBed.page, 'infra-sk', 'expandable-textarea-sk_open');
    });
  });
});