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This seems to me quite redundant:
+ Matches any Unicode decimal digit; more specifically, matches
+ any character in Unicode category [Nd] (Number, Decimal Digit).
+ This includes ``[0-9]``, and also many other digit characters.
I suggest something like:
Matches the decimal digits ``[0-9]`` and all the characters that belong
to the Unicode category Nd (Number, Decimal Digit).
Two more minor details: instead of '\d', I'd use '^\d$' and instead of
self.assertEqual(re.match('\d', x), None)
self.assertIsNone(re.match('\d', x)).