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The attached new version of the test script add test for wrong
parameter passed to the callbacks or wrong results returned
from the callback. It also add tests to the long string
tests for copies of the builtin error handlers, so the codec
does not recognize the name and goes through the general
callback machinery.

UTF-7 decoding still has a flaw inherited from the current
implementation:

>>> "+xxx".decode("utf-7")                    
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
UnicodeDecodeError: 'utf7' codec can't decode bytes in
position 0-3: unterminated shift sequence
*>>> "+xxx".decode("utf-7", "ignore")
u'\uc71c'

The decoder should consider the whole sequence "+xxx" as
undecodable, so "Ignore" should return an empty string.
Currently the correct sequence will be passed to the
callback, but the faulty sequence has already been emitted
to the result string.