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Add tests for collection mixins (see issue #2531) #2535

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DiegoBaldassarMilleuno
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As requested in #2531 (comment), submitting a draft pull request testing for compliance to collections.abc protocols by a few standard containers.
Currently many tests fail.

A few notes:

  1. the tests that hard crash are temporarily disabled via pytest.mark.xfail, for convenience;
  2. many requirements I added in these tests are rather pedantic (like supporting values of the wrong type in __contains__ or requiring specific exceptions to be thrown); maintainers feel free to remove any that you believe are outside of contract.
  3. I haven't checked that this works with older versions of Python, it's a quick draft

Adding testing for adherence to collections.abc protocols for the
following classes: Array, List, ImmutableArray, ImmutableList,
Dictionary, ImmutableDictionary and ReadOnlyDictionary
Tests for Python list and dict are also present as a
reference but commented out.
Also made sequence __deitem__ test not rely on negative indexes
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