Optaweb Employee Rostering: backend module cannot execute tests

Tests in backend module of optaweb employee rostering are not found due to productized version of junit on classpath:
junit:junit:jar:4.12.0.redhat-003

Surefire plugin' log puts some light on what is happening:
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1. Created at 2020-02-25T08:51:03.388
   Feb 25, 2020 8:51:03 AM org.junit.platform.launcher.core.DefaultLauncher handleThrowable

1. Created at 2020-02-25T08:51:03.388
   WARNING: TestEngine with ID 'junit-vintage' failed to discover tests

1. Created at 2020-02-25T08:51:03.388
   org.junit.platform.commons.JUnitException: Failed to parse version of junit:junit: 4.12.0.redhat-003
   -----------------------------------------------------------------------

There is junit5 on classpath as well, pulled by org.springframework.boot:spring-boot-starter-test. As the junit5 platform tries to bootstrap junit4 engine, it fails to parse its version.