sentry/tests/js/spec/components/banner.spec.tsx

import {mountWithTheme} from 'sentry-test/enzyme';

import Banner from 'app/components/banner';

describe('Banner', function () {
  it('can be dismissed', function () {
    const banner = mountWithTheme(<Banner dismissKey="test" />);
    expect(banner.find('BannerWrapper').exists()).toBe(true);

    banner.find('CloseButton').simulate('click');

    expect(banner.find('BannerWrapper').exists()).toBe(false);
    expect(localStorage.getItem('test-banner-dismissed')).toBe('true');
  });

  it('is not dismissable', function () {
    const banner = mountWithTheme(<Banner isDismissable={false} />);
    expect(banner.find('CloseButton').exists()).toBe(false);
  });
});