Some tests were failing under Py3K since the json library behaves a little
differently when it comes to decoding bytestrings. To fix this, the
simulate_request helper method was extended to take a new "decode" arg,
so tests can get a decoded string right off the bat.
Here is the docstring:
decode: If set to a character encoding, such as 'utf-8',
the method will assume the response is a single
byte string and will decode it and return a single
wide string instead of the raw WSGI response iterable.
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