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I've improved calendar.py test coverage a bit.
Before:
 410 71% calendar (.../Lib/calendar.py)
After:
 410 77% calendar (.../Lib/calendar.py)

Thanks for the patch.
There are a couple of things I'd change, which I or someone could do while committing if you prefer, but if you'd like to tune up the patch yourself that would be great.
The first is that I'd break up the tests that run more than one test into separate test methods (test_formatweekheader, test_formatmonthname, test_output_htmlcalendar). The second is that the exception tests can be written more compactly (and IMO more legibly) like this:
 def test_illegal_month_reported(self):
 with self.assertRaisesRegex(calendar.IllegalMonthError, '65'):
 calendar.monthrange(2004, 65)

Thanks for the review.
I'll happily tune the patch myself. Just when I have some spare time again.

I didn't event know that there is such a handy assertRaisesRegex context.
Many thanks for pointing this out!

New changeset 98bc9e357f74 by R David Murray in branch 'default':
#14796: improve calendar test coverage.
http://hg.python.org/cpython/rev/98bc9e357f74 

Thanks, Oleg.

> New changeset 98bc9e357f74 by R David Murray in branch 'default':
> #14796: improve calendar test coverage.
> http://hg.python.org/cpython/rev/98bc9e357f74
The following added test fails on Windows:
...
+ def test_yeardatescalendar(self):
+ def shrink(cal):
+ return [[[' '.join((d.strftime('%D')
+ for d in z)) for z in y] for y in x] for x in cal]
 self.assertEqual(
- cal.formatyearpage(2004, encoding=encoding).strip(b' \t\n'),
- result_2004_html.strip(' \t\n').encode(encoding)
+ shrink(calendar.Calendar().yeardatescalendar(2004)),
+ result_2004_dates
+ )
...
The "%D" format is not supported by strftime(). Extract of timemodule.c:
#if defined(MS_WINDOWS) && !defined(HAVE_WCSFTIME)
 /* check that the format string contains only valid directives */
 for(outbuf = strchr(fmt, '%');
 outbuf != NULL;
 outbuf = strchr(outbuf+2, '%'))
 {
 if (outbuf[1]=='#')
 ++outbuf; /* not documented by python, */
 if (outbuf[1]=='0円' ||
 !strchr("aAbBcdHIjmMpSUwWxXyYzZ%", outbuf[1]))
 {
 PyErr_SetString(PyExc_ValueError, "Invalid format string");
 Py_DECREF(format);
 return NULL;
 }
 }
#endif

New changeset d3321c010af5 by R David Murray in branch 'default':
#14796: fix failure of new calendar test on windows.
http://hg.python.org/cpython/rev/d3321c010af5 

The buildbots seem happy.