[Mono-list] Need more corlib tests

[Shahms E. King]

If someone wants to add to the DateTime test case, I know one more place
it fails (it's in bugzilla, btw):

DateTime.MinValue.Year is a negative number, and a very large one at
that, it should be 1.  I'd write the test case myself, except I'm not
sure what the bug is exactly, only that one symptom.  It could be a
simply matter of year values < 1 needing to be rounded to 1 or it could
be a more serious problem with the calculation of Year from Ticks, not
exactly sure, but it does make DateTime.MinValue.ToString() toss up an
exception, which isn't a good thing ;-)

--Shahms