[issue24134] assertRaises can behave differently

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Updated patch includes tests for the function is None. There were no tests for assertRaises(), the patch adds them, based on tests for assertWarns().

> Why not sentinel = Object()?

Only for better repr in the case the sentinel is leaked. Other variants are to make it named object, such as a function or a class, as Magnus suggested.

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Added file: http://bugs.python.org/file39306/assert_raises_sentinel_2.patch

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