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

[Eric Snow]

Eric Snow added the comment:

Regarding this issue, keep in mind that namespace packages have a dynamic __path__ which already updates (effectively) when new portions are added to sys.path.  So we just need to make sure that reloading does not break that.

To that end, here's a much simpler patch (with passing tests) that verifies that PEP 451 did not break anything here.

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Added file: http://bugs.python.org/file34661/issue19711-test_namespace_pkgs.diff

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