Description

This pull request updates behavior.spec.js so as to actually test the expected behavior, using Sinon spies as a synchronous alternative to Mocha done callbacks.

Additional information

The behavior.spec.js file is not currently testing anything meaningful, because it is passing init callbacks with an incorrect function signature (behavior({ init }) vs. behavior(events, { init })). This is also remarked in a comment at the top of the file, accompanied by disabling all ESLint rules for the file to prevent flagging done() calls which reference a done variable that does not exist.

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