A project for reproducing issue with listeners in TestNG 7.5

(compared to 7.4.0)

The issue itself: testng-team/testng#2771

How to reproduce the problem

Command mvn test should fail.

It fails (as expected) with TestNG 7.4.0, but
it's green with TestNG 7.5 - and this is a bug!

Explanation

Problem the problem was introduced in testng-team/testng#2558 (but I am not sure).