Refactor ObjectServiceTest Mocking
Refactor ObjectServiceTest Mocking

Summary:
It should be avoided to Mock functions of the subject
under test and third party objects should be injected as mock.

The CmisBindingsHelper is now injected as mock instead of mocking
internal functions that use this class.

Reviewers: #forgetit-dev, claus.due

Reviewed By: #forgetit-dev, claus.due

Differential Revision: https://phabricator.dkd.de/D721

dkd/php-cmis-client