Write integration tests for distributed data models

[asishallab]

Use the latest development branch and write integration tests for Cenzontle Web Service Data Models.

Test all CRUD API functions, including search, sort, and pagination. Also test associations.

The tests should make sure that a single "read many" is able to fetch records from different servers. Also tests distributed associations in that matter. Provide tests for the API functions / arguments:

probably already included, but just to be sure:

• skip-check-existence-of-association
• exclude-adapters

Put all tests into a single describe block, and make sure that at the end of the test a cleanup is done, that removes all created records from the respective databases. The setup should be in the state identical to before this describe block starts.

To clean up consider using an after block as made available in mocha / chai tests.