Summary: Switch to using IS_TESTING on the Platform module. While IS_TESTING has to be explicitly set in the test harness, this makes it more usable and stops people from relying on brittle variables in the (larger) environment.
Reviewed By: fkgozali
Differential Revision: D4423661
fbshipit-source-id: 27a80867778b9374bcba67b69f9c93d32c0a74b0