Check JUnit5 support

[oscarlvp]

Characteristics

• Issue Type: test report
• Reproducibility: always
• Severity: major

Description

We have observed that, in some projects, after the test cases are migrated to Junit5, the results change with no other apparent cause than the version of JUnit.
For example:
In the apache/commons-lang project, the method ReflectionDiffBuilder.accept was classified as pseudo-tested in commit apache/commons-lang@ba7ca79 but as not covered in the later commit apache/commons-lang@729adb6

See the comparison between the two versions here

Several other methods in the same project exhibit the same behavior.

Steps to reproduce

Run PitMP for the two commits mentioned before.