/test_apiary/codec.py

#
# $LicenseInfo:firstyear=2010&license=mit$
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# Copyright (c) 2010, Linden Research, Inc.
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import unittest
from cStringIO import StringIO
from apiary.tools.codec import Message, FormatError
    

class CodecTests (unittest.TestCase):
    def testCodecSymmetry(self):
        for body, hdrs in PositiveTestVectors:
            msgin = Message(body, **hdrs)
            msgout = Message.decode_from_string(msgin.encode_to_string())
            self.failUnlessMessagesEqual(msgin, msgout)
            
    def testStreamSymmetry(self):
        msgs = []
        
        f = StringIO()
        for body, hdrs in PositiveTestVectors:
            msgin = Message(body, **hdrs)
            msgin.encode_to_file(f)
            msgs.append(msgin)

        f.seek(0)

        for msgin in msgs:
            msgout = Message.decode_from_file(f)
            self.failUnlessMessagesEqual(msgin, msgout)
            
    def testNegativeEncoding(self):
        for body, hdrs in NegativeTestVectors:
            try:
                Message(body, **hdrs).encode_to_string()
            except FormatError:
                continue # This negative test passes.
            self.fail('Constructed an invalid message: body %r; headers %r' % (body, hdrs))
                
    def failUnlessMessagesEqual(self, a, b):
        self.failUnlessEqual(a.headers, b.headers)
        self.failUnlessEqual(a.body, b.body)
            
        


PositiveTestVectors = [
    ('', {}),
    ('foo', {'fruit': 'banana'}),
    ('x' * (2**20), {'description': 'A mebibyte of xs.',
                     'reason': 'Pure OSSMness.'}),
    ]


NegativeTestVectors = [
    ('', {'body_length': 7}),
    ('', {'body_length': -1}),
    ('bad header type', {'bad_header': object}),
    ]