Ask HN: What sort of automated functional testing setup do you have?

Just wanted to get an idea, what sort of an automated functional testing setup do companies generally have?

Among other things:

- Is there any alternative to Selenium based automated testing or is Selenium the most popular way of doing automated functional testing?

- Have you set up a Selenium grid in-house or integrated with Sauce Labs / BrowserStack etc.? Is it costly to do so in-house?

- Do you test across how many different combinations of OS and browsers?

- Is testing only on headless browsers very common?

- Do you test on both desktop and mobile browsers?

- Is your setup integrated with a CI tool?