Convert JMockit @Tested and Deencapsulation when migrating to Mockito

[timtebeek]

What problem are you trying to solve?

We want to achieve a complete migration coming from JMockit going to Mockito.
It seems we don't yet cover either the @Tested annotation, nor the Deencapsulation class.

There's been some related tests added in this PR for anyone looking to take this on

• Add unit tests for JMockit Delegate to mockito migration. Also add test case for comments #557

Have you considered any alternatives or workarounds?

As a first step we could identify such cases and suggest to migrate these manually.

Any additional context

This was a reported via email.