[issue12659] Add tests for packaging.tests.support

[Francisco Martín Brugué]

Francisco Martín Brugué <francismb at email.de> added the comment:

> Patch looks good, thanks!  BTW are you running a coverage tool to see > how far along we are?

Yes, always. The classes tested in that patch are at 100%.

The overall coverage is:

Name                          Stmts   Miss  Cover   Missing
-----------------------------------------------------------
Lib/packaging/tests/support     173     34    80%   296-301, 306-310, 334-337, 341-347, 371-390, 395-396

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