cjohansen/Sinon.JS — pull request #98 by elentok (2012-03-17 18:16:29+00:00)
Title: use JSON.stringify() instead of args.join(", ")

use JSON.stringify() instead of args.join(", ") to show the expected arguments when using "calledWith" asserts.
without this, it returns something like this:

AssertError: expected method to be called with [Object]

which isn't very helpful.