Tests that plug-ins can query for the contents scale factor

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS plugin1.contentsScaleFactor is undefined
PASS plugin1.cachedContentsScaleFactor is undefined
PASS plugin1.contentsScaleFactor is undefined
PASS plugin1.cachedContentsScaleFactor is undefined
PASS plugin2.contentsScaleFactor is undefined
PASS plugin2.cachedContentsScaleFactor is undefined