Allow access to mocha context from unit tests

[jswitzer-lulus]

Is your feature request related to a problem? Please describe.
Some of our unit tests take longer then 5 seconds to complete. There should be a way to work around this. Currently there is not.

Describe the solution you'd like
A simple solution would be to allow access to the mocha context from the unit test blocks. This would also allow access to a number of other useful mocha features.

Describe alternatives you've considered
A global or test suite level preference would be a nice feature in the future but it seems much more involved.