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Add tests for checking for multiple locks

Leaving these in here since it's good to test but
we found that event machine seems to be creating multiple
event callbacks when it gets blocked. This causes
multiple locks to appear inside redis when running a single
ruby process with a single tradesman.
Ruby 2 can't use debugger, use byebug

byebug is the debugger replacement for debugger
and we also then need to use pry-byebug
Add @timer.wait to trigger waiting for the timer to fire