I have the pleasure of using both IntelliJ and Resharper.
What I have noticed is the Resharper unit test runner is awesome, the Intellij one, slightly less awesome.
In Reshaper, if you run a suite of tests and have a failure, you can click and re-run a failed test, it then leaves the previously run suite, and just 'spins' the failed test in place.
Basically this allows you to work through your failures one at a time, without loosing the 'current suite status'
The IntelliJ test runner throws away the entire suite every execution., and just runs that single test as a new suite.
Perhaps there is just some setting I am missing in IntelliJ, if not can you make the IntelliJ test runner awesome too?