Most ember apps when created new or that are existing all along have phantomJS configured for running tests. phantomJS runs a little flaky for some tests that involve keyboard events. And phantomJS is no longer actively maintained due to the arrival of Google Chrome headless support.

Link to this sectionStep 1: Installing Google Chrome in Linux machines

You may also refer: https://www.tecmint.com/install-google-chrome-in-debian-ubuntu-linux-mint/ if you face any issues with installing Google Chrome with the above steps.

Link to this sectionStep 2: Setting up Chrome headless for QUnit instead of phantomJS

Remove testem.json if you have it configured, and move the contents to testem.js (though this is not mandatory, testem itself throws a warning when you have both). Add the following in the testem.json file and remove phantomJS configurations.

Link to this sectionStep 3: Debugging in dev for visual representation

Launch chrome with http://localhost:7357 Using 9222 port should also work for remote debugging using http://127.0.0.1:9222

Link to this sectionFor more inputs on Google chrome headless

https://developers.google.com/web/updates/2017/04/headless-chrome

Link to this sectionWhy Chrome headless and why not phantomJS

PhantomJS: Stepping down as maintainer | Hacker News

While headless chrome might be able to replace PhantomJS for many use cases that doesn't necessarily mean the APIs will - news.ycombinator.com

Link to this section[Announcement] Stepping down as maintainer

PhantomJS no longer maintained - Build Chain, JS Testing, … · Issue #547 · SharePoint/sp-dev-docs

"…PhantomJS is no longer maintained anymore. I guess we will see and replacement…" github.com