[Touche]

> Initially Meteor didn't have any support for testing apps.

I don't understand what this means... why do you need a framework to "support" testing. Can't you just... write a test using QUnit or Mocha or Tape or whatever you like?

[jimbobimbo]

The framework can make or break your testing. If it's very hard or impossible to mock parts of the framework, your testing will be significantly hindered.