pane-axis-element-spec.js

const PaneAxis = require('../src/pane-axis');
const PaneContainer = require('../src/pane-container');
const Pane = require('../src/pane');

const buildPane = () =>
  new Pane({
    applicationDelegate: atom.applicationDelegate,
    config: atom.config,
    deserializerManager: atom.deserializers,
    notificationManager: atom.notifications,
    viewRegistry: atom.views
  });

describe('PaneAxisElement', () =>
  it('correctly subscribes and unsubscribes to the underlying model events on attach/detach', function() {
    const container = new PaneContainer({
      config: atom.config,
      applicationDelegate: atom.applicationDelegate,
      viewRegistry: atom.views
    });
    const axis = new PaneAxis({}, atom.views);
    axis.setContainer(container);
    const axisElement = axis.getElement();

    const panes = [buildPane(), buildPane(), buildPane()];

    jasmine.attachToDOM(axisElement);
    axis.addChild(panes[0]);
    expect(axisElement.children[0]).toBe(panes[0].getElement());

    axisElement.remove();
    axis.addChild(panes[1]);
    expect(axisElement.children[2]).toBeUndefined();

    jasmine.attachToDOM(axisElement);
    expect(axisElement.children[2]).toBe(panes[1].getElement());

    axis.addChild(panes[2]);
    expect(axisElement.children[4]).toBe(panes[2].getElement());
  }));