Multi-module maven projects: gzoltar.ser contains TestClasses of other submodules

[delsner]

Context

I have a minimal multi-module maven project with 3 submodules with each 1 unit and 1 integration test (IT).
When running mvn gzoltar:prepare-agent test on the parent-module, the gzoltar agent is instrumentized for all submodules and I get a gzoltar.ser file in each target/ directory of the individual submodules.
However, every gzoltar.ser includes the TestClasses of the submodules, that were run before.
E.g., submodule 1 creates a gzoltar.ser with org.submodule.one.TestOne,
submodule 2 creates a gzoltar.ser with org.submodule.one.TestOne (again!) and org.submodule.two.TestTwo.

Steps to Reproduce

The project is located here.
The steps to reproduce the behavior are:

1. mvn clean test-compile (in root)
2. mvn gzoltar:prepare-agent test -Dgzoltar.granularity=method (in root, try line if it breaks)
3. mvn gzoltar:fl-report (in root)
4. Check site/gzoltar/sfl/txt/tests.csv of each submodule

GZoltar arguments

s.a.

Expected behaviour

I would expect a separate gzoltar.ser for each submodule which only contains those TestClasses that are in the respective target/test-classes of the submodule, but not TestClasses from previously tested modules.

Environment (please complete the following information, if relevant):

• OS: MacOS 10.14.5
• Version 1.7.2 (maven 3.6.1)

Additional comments

Another question I wanted to ask is if you ever instrumented integration tests with the maven failsafe plugin with gzoltar.
If yes, I would be thankful for any advices or shared experiences.