In eclipse:
How can I know the version of JUnit
If you selected JUnit4 over JUnit3, the version that Eclipse uses is the one in eclipse/plugins/org.junit_XXXX. For Eclipse Luna, it is eclipse/plugins/org.junit_4.11.0.v201303080030. Note that if you want to change it, based on all the things I tried, you can replace the junit.jar contained inside with the version you want.