[SUREFIRE] How does Junit4VersionsIT work?

[Benedikt Ritter]

Hi surefire devs,

I don't understand how the Junit4VersionsIT sets the JUnit version to use
during testing. The version is set as sysProp "junit.version" on
mavenLauncher, but the test pom.xml in the resources/junit4 folder
uses ${junitVersion} to set the JUnit version. How does this work? Does
maven automatically convert between the two property keys?

Regards,
Benedikt