[issue12600] Add example of using load_tests to parameterise Test Cases

[Mark Lawrence]

Mark Lawrence added the comment:

Any volunteers to do this?  I'd do it myself but by the time somebody explains the detail, it'd probably be easier just to write a patch.  

@Robert just FTR do you know the issue number for "the use of __str__ by the stdlib [which isn't easily overridable - there is a separate issue on that]" which you mention in msg177328?

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nosy: +BreamoreBoy

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