fix(jest-fake-timers): Return real Date.now()
from jest.now()
when real timers are in use
#13246
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Summary
Quick follow up to #13244, applying the review suggestion that
jest.now()
should return realDate.now()
if real timers are in use. Currently, it will throw if the clock has not previously been initialised.Test plan
Added unit tests for the real timer case - also cleared up some
global
pollution in adjacent tests.