Test resources not found from unit test

[nenick]

The issue with missing src/test/resources is tracked at https://code.google.com/p/android/issues/detail?id=136013

There is a known workaround https://code.google.com/p/android/issues/detail?id=136013#c10 Another approach can be found at https://github.com/evant/android-studio-unit-test-plugin/issues/4