Thank you for the feedback. I've changed the translation based in your requirements! could you check it again?

• Tests should use JUnit 5 and not JUnit 4.
• Why do null or empty string result in a "regular" ball? Is this behavior specified in the task statement? Are these inputs considered valid?
• Equality should be tested with assertEquals, and not with assertTrue(x.equals(y)).
• The Ball.equals does not hold to requirements of the contract the immplementations of equals must fulfill. The Ball is not required to implement equals by this kata, but if it does, it should to this correctly.

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Java translation translation added ^^