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PyPy includes modified Python 2.7 tests for testing compatibility. Some of changes skips tests for features that are not implemented in PyPy or are CPython specific, some reflects differences between error types or messages in CPython and PyPy, some are needed because PyPy doesn't use reference counting, some are workarounds for known PyPy or CPython bugs. The purpose of this issue is to port harmless non PyPy-specific changes. I'll split full patch on several parts for easier review.
The first patch in a series just adds gc.collect() or test.test_support.gc_collect() calls to force calling destructors or freeing memory.