Add wait argument to qtbot.assertNotEmitted

[The-Compiler]

I swear this is the last one 🙈 Take your time to review things though, I'm not in a hurry!

Needed this for some tests in qutebrowser recently, and it seems simple enough to add it.

[coveralls]

Coverage decreased (-2.7%) to 96.408% when pulling a2af859 on The-Compiler:assert-not-emitted-wait into 0a19255 on pytest-dev:master.

[nicoddemus]

LGTM! Just need to fix the linting errors and we can merge this. 😁

[The-Compiler]

Whoops, accidentally had a ; at the end of the line in the docs 😆 That's what I get for writing JavaScript, C++ and Python on the same day!

[The-Compiler]

Thinking about this some more, I noticed a QEventLoop is spin up every time assertNotEmitted is used now (with the default timeout=0), which seems weird.

I've opted to just not spinning up an event loop with qtbot.waitSignal(..., timeout=0) at all, see the last commit - what do you think?

[nicoddemus]

I've opted to just not spinning up an event loop with qtbot.waitSignal(..., timeout=0) at all, see the last commit - what do you think?

Seems reasonable, thanks!

[nicoddemus]

(and sorry for the delay!)