Github user zentol commented on the issue:
https://github.com/apache/flink/pull/3790
As you can see in the `UnaryOperatorTestBase` the constructor is already
protected. The thing is that junit complains since the classes contain junit
annotations (`@After`, `@Parameterized`) class but can't be instantiated. When
i run these test in IntelliJ they are marked as failed tests due to an
initialization error.
Making the classes abstract makes it clear they aren't actually
self-contained test classes.
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