emberjs/ember.js — pull request #5272 by trek (2014-07-29 02:32:48+00:00)
Title: Tests for triggerEvent's many argument signatures

triggerEvent has many arities (some were untested):

```
selector, type
selector, context, type
selector, type, options
selector, context, type, options
```

see https://github.com/emberjs/ember.js/issues/5265 and https://github.com/emberjs/ember.js/pull/5165#discussion_r14915117