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test gives out triangles like (12, 47, 21)

Ruby 3.0 should be enabled, see this to learn how to do it

Ruby 3.0 should be enabled, see this to learn how to do it

Ruby 3.0 should be enabled.

I think at least one more basic tests should be added because with only two examples we cannot be sure of what we're supposed to do.

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No tests with superfluous character at the beginning/end of the string.

Ruby translation kumited, including an updated description -- please check and approve (note: author is inactive)

in python at least, the random tests are sending inputs that aren't triangles... (like 6,55,93)

The direction to use switch statements feels a little forced here. Since there's a 1:1 input/output relation, and the input is always an integer (starting from 0, in fact), an array of key/value pairs feels way more intuitive than writing out the full syntax of a switch statement. I think it's good not just to teach newcomers how to use certain approaches, but also how to identify the best one.

A more switch-suited problem might be one where the function has to behave differently based on the input's type, or based on the outcome when a certain operation is performed on it.

Task is unclear. ( I was expecting eight coordinates as input, and worrying about all sorts of rotations already. )

Also, what's wrong with uninteger numbers? A cube with a volume of 2 or 99 is a perfectly good cube.

I'd commend you for all the maths gobbledygook, but you copied that from Wikipedia, and it has nothing whatsoever to do with the task.