sentry/tests/js/spec/components/issueDiff.spec.jsx

import React from 'react';
import {mount, shallow} from 'enzyme';
import {IssueDiff} from 'app/components/issueDiff';
import {Client} from 'app/api';
import entries from '../../mocks/entries';

jest.mock('app/api');

describe('IssueDiff', function() {
  let routerContext = TestStubs.routerContext();
  let api = new MockApiClient();

  it('is loading when initially rendering', function() {
    let wrapper = shallow(<IssueDiff baseIssueId="base" targetIssueId="target" />);
    expect(wrapper.find('SplitDiff')).toHaveLength(0);
    expect(wrapper).toMatchSnapshot();
  });

  it('can dynamically import SplitDiff', async function() {
    Client.addMockResponse({
      url: '/issues/target/events/latest/',
      body: {
        entries: entries[0],
      },
    });
    Client.addMockResponse({
      url: '/issues/base/events/latest/',
      body: {
        platform: 'javascript',
        entries: entries[1],
      },
    });

    // Need `mount` because of componentDidMount in <IssueDiff>
    let wrapper = mount(
      <IssueDiff api={api} baseIssueId="base" targetIssueId="target" />,
      routerContext
    );

    await tick();
    wrapper.update();

    expect(wrapper.find('SplitDiff')).toHaveLength(1);
    expect(wrapper).toMatchSnapshot();
  });

  it('can diff message', async function() {
    Client.addMockResponse({
      url: '/issues/target/events/latest/',
      body: {
        entries: [{type: 'message', data: {message: 'Hello World'}}],
      },
    });
    Client.addMockResponse({
      url: '/issues/base/events/latest/',
      body: {
        platform: 'javascript',
        entries: [{type: 'message', data: {message: 'Foo World'}}],
      },
    });

    // Need `mount` because of componentDidMount in <IssueDiff>
    let wrapper = mount(
      <IssueDiff api={api} baseIssueId="base" targetIssueId="target" />,
      routerContext
    );

    await tick();
    wrapper.update();

    expect(wrapper.find('SplitDiff')).toHaveLength(1);
    expect(wrapper).toMatchSnapshot();
  });
});