Add test to ensure concurrent dummy creation works
Add test to ensure concurrent dummy creation works

FakeItEasy/FakeItEasy,thomaslevesque/FakeItEasy,thomaslevesque/FakeItEasy,blairconrad/FakeItEasy,adamralph/FakeItEasy,adamralph/FakeItEasy,FakeItEasy/FakeItEasy,blairconrad/FakeItEasy