[issue20550] Use specific asserts in collections tests

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

The proposed patch makes collections tests use more specific asserts. This will provide more useful failure report.

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components: Tests
keywords: easy
messages: 210547
nosy: rhettinger, serhiy.storchaka
priority: normal
severity: normal
stage: patch review
status: open
title: Use specific asserts in collections tests
type: enhancement
versions: Python 2.7, Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20550>
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