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What Does This Do
Upgrade to Spock 2.
Motivation
Our versions of Spock is stuck at 1.x, which also gets us stuck at Groovy 2.x, which has some annoying bugs (like https://issues.apache.org/jira/browse/GROOVY-10137).
Additional Notes
Very far from ready.
Blockers:
SpockRunner
needs a completely different approach, since the JUnit 4 runner API is gone. Unfortunately, JUnit 5 / Spock 2 do not seem to support features that would allow to do these class transformations and classloader injection (see Introduce extension API for providing a custom ClassLoader (e.g., for Powermock) junit-team/junit5#201). I think we'll end up with a small Java agent for this task.