axios calls don't return

I have a suite of integration tests that use axios - which in turn uses the newly mocked out XMLHttpRequest. These calls don't return anymore.

I do stub out the API requests for the rest of my test suite, but I'd still like to be able to run integration tests to verify the contracts for some of the APIs - verifying the integration doesn't break.

Is there a way to replace the mock or unmock it? This used to work before 0.3.0.