Testing Blaze components with callbacks

[pandawhisperer]

I’ve been trying to get this to work for a while, but I’m still stuck. Basically, I have a component similar to the Meteor Guide, and a unit test for that based on the Meteor Testing Guide. This component can be passed a callback, which it will call when some internal state has changed.

Now I’m trying to write a unit test for this behavior – however, I can’t get the test to pass. It looks as though the withRenderedTemplate() helper from the guide may be removing the component before the callback had a chance to run, and thus the test fails. Original post (on the guide article) linked below.

Has anyone solved this issue before? How did you do it?

Testing guide article

Let’s say I’m writing a unit test for a Blaze component based on the section A Simple Unit Test in the guide, using the withRenderedTemplate() helper from the test-helpers.js provided in that section. Let’s also say my component has some internal state that I want to write an assertion against (the example test only shows how to write assertions against the rendered DOM result). In other words, I’m trying to get a hold of the component’s state (or at least its Template instance) from the ca…