3e278db Remove tests using Bug::NotImplement class.

Authored and Committed by jaruga 3 years ago
    Remove tests using Bug::NotImplement class.
    
    On Ruby 2.5.5, it's not implemented in ext/-test-/notimplement/bug.c .
    The patch is available from 2.6.
    See https://github.com/ruby/ruby/commit/0381ec5164c12a20bf5889c18b3a5d94ad7af623