For anyone experiencing this issue when running unit tests, my work around was to disable code coverage. Note that this only works if you are on Beta 2. I tried the same workaround on Beta 3 and it no longer works so I'll stick with beta 2 for now.
rpassis2
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For those of you who tried reading all the documentation and steps described above but things are still not working, make sure you check your device under Settings -> Developer and flip the Associated Domains Development switch to ON.