Calling ->onlyMethods( [] ) with an empty array does have an effect.
By default, all methods are mocked, which means the original code is
not called. Calling ->onlyMethods( [] ) turns this around. No methods
are mocked but all call the original code.
This is almost the same as ->enableProxyingToOriginalMethods(). The
difference is that ->enableProxyingToOriginalMethods() also requires
the original constructor to be called, but ->onlyMethods( [] ) does
not.
We can get rid of this confusing setup in tests that don't need it.
All tests in this patch that succeed with a simple ->createMock()
just demonstrated that they don't need it.
Change-Id: I341323a1ca793c039498f80b7f073c124b6b6ae0
02971ace54