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Sorry to pollute here, but just an FYI:
Setting line 103 
to:
environ['TZ'] = 'Australia/Victoria'
and changing lines 106-
107 to:
self.failUnless(time.tzname[0] == 'EST', 
str(time.tzname[0]))
self.failUnless(time.tzname[1] == 'EST', 
str(time.tzname[1]))

all subsequent tests pass just fine, and 
the module test completes successfully.

Granted, I don't know 
what the difference between EST and EDT is, but it works. 
(=

With line 103, setting environ['TZ'] as the var 'victoria' and 
setting line 107 to AEST, that test passes, but as I mentioned before, the 
time.daylight test fails.