The example on the page doesn't work for me. After running fresh-node and then npm ci && npm run selenium I get:
chromedriver running with PID 110
Starting ChromeDriver 71.0.3578.80 on port 4444
Only local connections are allowed.
[1569232858.798][SEVERE]: bind() returned an error, errno=99: Cannot assign requested address (99)
And later during test execution:
connect ECONNREFUSED 127.0.0.1:8080