continue from the mock context for groups

…roughly

tests did not performed correctly because of an empty classMetadata

…ding to the other tests.

Some refactoring of the tests should be performed too (move something into setup method + removing duplicating setup among other my test methods)

if an identifier is passed but is excluded by the group rules, the fallback objectconstructor is called (doctrine can't find the entity without the id, which must be ignored in this case)

…class for backward compatibility reasons (final class in old versions)

…sues"

This reverts commit 702926e

…ity (final class)

…sues