mac osx flakes: reverse test for error code & call-count assertions
mac osx flakes: reverse test for error code & call-count assertions

[#168280372](https://www.pivotaltracker.com/story/show/168280372)

Co-authored-by: Alexander Berezovsky <a12e46294a7d630b60bbba114755367d6bafe2fb@pivotal.io>
Co-authored-by: Eric Promislow <6c389fa4d719bbeec88fea52ca3b2497804923ad@suse.com>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli