[issue7944] Use the 'with' statement in conjunction with 'open' throughout test modules

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

I'm not sure that this is a worthwhile exercise unless it can be shown for certain that alternate implementations need this.  Otherwise, it just changes tests in a way that isn't backwards compatible, makes it more difficult to apply patches cleanly, and risks damaging an otherwise good test.

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nosy: +rhettinger

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