I have found one way to stop a Jasmine 2.0 Unit Test returning to Resharper. Whether its the best way I don't know, but it works. Include the line below in the test you don't want to complete.
ReSharperReporter.prototype.jasmineDone = function () { };
You will need to press stop on Resharper Unit Test page to stop the test.
I should say that doing this doesn't stop the Jasmine test finishing, so you don't have access to any locals inside the test. I have voted up this issue on the Resharper web site as there has to be a better solution. If you have this problem then I suggest you vote this up too.