before and after each hooks

[SBoudrias]

Some tested methods may have side effects on the environment. It'd be useful if we could specify beforeEach and afterEach hooks.

[stephenmathieson]

+1

[Qard]

+1 I have a bunch of terribly inaccurate benchmarks due to spending as much or more time on the setup for each iteration as I am doing the actual thing I want timing information for... >.>