Fix MappingTest kwargs issue
What does this MR do and why?
Extracted from !70798 (closed).
This breaks on Ruby 3, but works on Ruby 2, because of the Separation of positional and keyword arguments in Ruby 3.0
: https://www.ruby-lang.org/en/news/2019/12/12/separation-of-positional-and-keyword-arguments-in-ruby-3-0/
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Edited by Aleksei Lipniagov