Fix flakey tests

There are five flakey tests that have to do with ensuring the `window.onerror` is called and works properly. This needs to be mocked or figure out why the test occasionally hangs.

```
- should pass undefined:undefined...
log: window.onerror(undefined, undefined, 1337, undefined)

log: matches test message and line number
X should pass undefined:undefined
Error: Timeout - Async function did not complete within 5000ms (set by jasmine.DEFAULT_TIMEOUT_INTERVAL) (1)
>> Error: Timeout - Async function did not complete within 5000ms (set by jasmine.DEFAULT_TIMEOUT_INTERVAL) Error: Timeout - Async function did not complete within 5000ms (set by jasmine.DEFAULT_TIMEOUT_INTERVAL)
>> at
when no 5th argument (error object)
```