Failed before blocks don't save screenshots

[jkrems]

When tests fail, testium saves screenshots. Unfortunately the same does not happen for before blocks which makes debugging them pretty hard.

[EndangeredMassa]

Failures in before hooks cancel the entire sub-suite to which they are attached. It will run after hooks, but not afterEach. I'm not sure if that is the intent, though. mochajs/mocha#1043

I tried setting up a global beforeEach hook to save the test context and grab a screenshot if the previous test context still existed (implying the after hook didn't fire), but before hooks are called (and failed in this use case) before beforeEach hooks.

We can't wrap before with special handling because mocha redefines it's globals in between each file.

It looks like the only fix is to change mocha itself. I am hoping that mochajs/mocha#1139 gets some attention.