Thanks for reporting this.

I can fix this particular error easily by repr'ing the keys. In the process I've found another fun way of killing this assert method:


        one = ''.join(chr(i) for i in range(255))
        two = u'\uFFFD'
        first = {'foo': one}
        second = {'foo': two}
        self.assertDictContainsSubset(first, second)

  File "/Users/michael/Dev/Packages/python-trunk/Lib/unittest/case.py", line 728, in assertDictContainsSubset
    (key, value, actual[key]))
UnicodeDecodeError: 'ascii' codec can't decode byte 0x80 in position 143: ordinal not in range(128)