Add tests for on parent value

As described in https://github.com/jackalope/jackalope/pull/286/files#r32197564 there are still some implementations left in jackalope-doctrine-dbal, but the tests are still succeeding, which is an indicator for me that these tests are missing in the test suite.

The according part in the specification is section 3.13.9 on http://www.day.com/specs/jcr/2.0/3_Repository_Model.html
