I’m new to Meteor, so I wasn’t sure how to bring attention to this, but the tutorial was giving me no end of trouble in the testing section, because running the meteor test --driver-package meteortesting:mocha command does the exact opposite of what the docs claim: it only runs tests in the test/ directory, and none of the *.test[s].js files. After being a confused for a while, I noticed that package.json contains a ‘testModule’ attribute which is set to ‘test/main.js’, and upon deleting this, it worked. I did a little digging and this appears to be really recent. The tutorial (and other docs on testing, like this section) should probably be updated to reflect this and tell users to remove or edit this line in package.json in order to get the expected behavior.