The Perfect Numbers exercise contains a helper file Classification.groovy with an enum definition (which the tests expect to be used). The file gets downloaded when using the CLI, but it is not visible when solving the exercise online: The editor only shows PerfectNumbers.groovy. This is rather confusing.
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This should fix it. perfect-numbers: make helper class visible in editor by glennj · Pull Request #425 · exercism/groovy · GitHub
Thanks my dear :D