Fix intermittently failing unit test

Created by: dsparacio

There are two test that stay pending and one that intermittently fails.

FragmentModel - should not be postponed after creation ✓ should not have any loading, executed, canceled or failed requests when a request has been added ✓ should fire streamCompleted event for a complete request when a request has been passed for executing ✓[90m should fire loadingStarted event a request - should remove the request from pending requests ✓ should add the request to loading requests ✓ should be able to abort loading requests 31 passing (1s) 2 pending 1 failing

1. TimelineConverter when the live edge is found should calculate availability window for dynamic mpd: AssertionError: expected 0.0009999999999976694 to equal 0
   • expected - actual -0.0009999999999976694 +0