'The output of L{BytesEnviron} should always be a L{dict} with L{bytes}
values and L{bytes} keys.'

def test_alwaysBytes(self):

    result = bytesEnviron()
    types = set()
    for (key, val) in iteritems(result):
        types.add(type(key))
        types.add(type(val))
    self.assertEqual(list(types), [bytes])
