[issue2578] additional unittest type equality methods

[Michael Foord]

Michael Foord <michael at voidspace.org.uk> added the comment:

Patch for Py3k with fallback for comparing unsortable sequences in
assertSameElements.

Removed the expected failure and added another test case to confirm that
this patch works for unsortable sequences that are the same (no fail)
and different (fail).

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Added file: http://bugs.python.org/file13614/unittest-sameelements.diff

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