Mocha reports global variable leaks by default. If you’re using jQuery to fetch JSONP data, mocha will report the random jQuery callback functions as leaks.
To make mocha ignore the JSONP callback functions, just add jQuery* to mocha’s list of registered globals.
For the browser based version of mocha, register the globals using the setup method.
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This little tip was not obvious to me in the mocha documentation and required digging through the code a bit.