I worked for Sony in Liverpool for about a year... 14-years go. It was pretty dull, play-testing pre-alpha games that I usually had little interest in. There where three different types of testing you could be involved in (at Sony)...
1) A skim test (1 to 5 days) of a game which is basically a release candidate, developed by anyone other than SCEE (Sony). This was probably the best one as you are basically playing a finished game for a short number of days, just reporting on any observations you find.
2) Compliance testing which basically involves checking that a completed game meets all the criteria set by Sony, i.e. checking the button mappings are correct, checking that the game runs on all the different versions of the PlayStation, checking that you can plug-in any peripheral without crashing the game... stuff like that.
3) Regular testing of a game all the way through it's development... this is where you can be on a game for months, from pre-alpha all the way through to release. This is where it gets boring.
... or you could get some weird duty like having to record yourself playing a game from start to finish, in a foreign language, so it can be sent to translators for verification.
At about £8,000 a year, the pay was rubbish... remember, this is 14 years ago.
The only good thing is that it looked good having Sony as the first job on my CV, so it made it easy to move on to something else.