Maven not works with test-jar imports

In can't use the test-jar type (as describer here: https://maven.apache.org/guides/mini/guide-attached-tests.html)

My problem is sligthly similar:

* I have a "master" module, which have standard classed and test classes

* I have a "support" module (intended to be a for-test-purpose module) that needs to extend a test class (not a regular class) of master 

* I have a "slave" module, which needs the "support" in the test classes

The "support" module don't see the test classes in the "master" module (build error).

If needed, I can provide some test modules