import { closeWindow } from './window-helpers';

import { BaseWindow, WebContentsView } from 'electron/main';

describe('WebContentsView', () => {
  let w: BaseWindow;
  afterEach(() => closeWindow(w as any).then(() => { w = null as unknown as BaseWindow; }));

  it('can be used as content view', () => {
    w = new BaseWindow({ show: false });
    w.setContentView(new WebContentsView({}));
  });

  function triggerGCByAllocation () {
    const arr = [];
    for (let i = 0; i < 1000000; i++) {
      arr.push([]);
    }
    return arr;
  }

  it('doesn\'t crash when GCed during allocation', (done) => {
    // eslint-disable-next-line no-new
    new WebContentsView({});
    setTimeout(() => {
      // NB. the crash we're testing for is the lack of a current `v8::Context`
      // when emitting an event in WebContents's destructor. V8 is inconsistent
      // about whether or not there's a current context during garbage
      // collection, and it seems that `v8Util.requestGarbageCollectionForTesting`
      // causes a GC in which there _is_ a current context, so the crash isn't
      // triggered. Thus, we force a GC by other means: namely, by allocating a
      // bunch of stuff.
      triggerGCByAllocation();
      done();
    });
  });
});