[issue19711] add test for changed portions after reloading a namespace package

[Roundup Robot]

Roundup Robot added the comment:

New changeset c22ec7a45114 by Eric Snow in branch 'default':
Fixes #19711: Add tests for reloading namespace packages.
https://hg.python.org/cpython/rev/c22ec7a45114

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nosy: +python-dev

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