Problem testing user interaction with QUnit

[IAmJulianAcosta]

When testing user interaction with QUnit there is an irregular behaviour, with on-focus and on-blur.

I'm testing the actions like this:

this.render (hbs`{{path/to/component}}`);
this.$ ('.selectize-input input').focus ();
this.$ ('.selectize-input input').blur ();

But sometimes it works, sometimes it doesn't work.