Enhance AssertSame/RefuteSame to check for object_id comparison

[fatkodima]

It is a very popular pattern:

# bad
assert_equal(expected.object_id, actual.object_id)

# good
assert_same(expected, actual)

Tested on rails/rails codebase and got 11 offenses.

[koic]

Since it's specialized for Minitest/AssertSame and Minitest/RefuteSame, there's likely no need for metaprogramming with eval.

[fatkodima]

But we define different things depending on where we use this method.

[koic]

If abstraction is needed, MinitestCopRule module should be extended. In this AssertRefuteSameHelper module implementation approach, please write a concrete implementation instead of using eval.

[fatkodima]

Updated.

[koic]

Thanks!