Ever deal with a large test suite before, monkey patching functions
to figure out whether it was called as expected? It's a dirty job.
If you're not careful, you can make a mess of things. Leave behind
evidence.

kgb's spies will take care of that little problem for you.

What are spies?

Spies intercept and record calls to functions. They can report on
how many times a function was called and with what arguments. They
can allow the function call to go through as normal, to block it,
or to reroute it to another function.

Spies are like mocks, but better. You're not mocking the world.
You're replacing very specific function logic, or listening to
functions without altering them.

Homepage:
https://github.com/beanbaginc/kgb
