Test generator tool

[Aksima]

The test generator tool for Groovy track is capable to automatically create tests using the information provided in canonical-data.json file. The generator allows exercise authors to generate tests automatically without having to write them by hand, and saves them a considerable amount of time. Generating tests automatically removes any sort of user error and allows the authors to concentrate on important details and implementation of reference solution.

[github-actions]

Hello. Thanks for opening a PR on Exercism 🙂

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[glennj]

This is a big PR to review, I won't be able to focus on it for a while.