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run the upcoming junit 4 to junit 5 migration cleanup
What it does
This Pr changes a bunch of tests from using JUnit 4 to JUnit 5.
It does not change anything at all about how jdt.ui works. Changes are in the testing code only.
However in the testing code it should not change anything neither. The migration from JUnit 4 suites to JUnit 5 suites was able to boost performance a little bit. I am not aware of similar effects in the testing code. So what this Pr gives you is that the affected classes are following a testing pattern using a actively maintained release for the first time in the last 20(?) years.
How to test
Count the number of tests and check results.
Author checklist