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Viewing changes to bzrlib/tests/test_bencode.py

  • Committer: Martin Pool
  • Date: 2009-07-10 06:46:10 UTC
  • mto: (4525.1.1 integration)
  • mto: This revision was merged to the branch mainline in revision 4526.
  • Revision ID: mbp@sourcefrog.net-20090710064610-sqviksbqp5i34sw2
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bzrlib/tests/test_bencode.py
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# Copyright (C) 2007, 2009, 2010 Canonical Ltd
 
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# Copyright (C) 2007 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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"""Tests for bencode structured encoding"""
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import sys
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from bzrlib import tests
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def load_tests(standard_tests, module, loader):
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    suite, _ = tests.permute_tests_for_extension(standard_tests, loader,
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        'bzrlib.util._bencode_py', 'bzrlib._bencode_pyx')
 
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    # parameterize all tests in this module
 
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    suite = loader.suiteClass()
 
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    import bzrlib.util._bencode_py as py_module
 
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    scenarios = [('python', {'bencode': py_module})]
 
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    if CompiledBencodeFeature.available():
 
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        import bzrlib._bencode_pyx as c_module
 
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        scenarios.append(('C', {'bencode': c_module}))
 
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    else:
 
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        # the compiled module isn't available, so we add a failing test
 
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        class FailWithoutFeature(tests.TestCase):
 
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            def test_fail(self):
 
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                self.requireFeature(CompiledBencodeFeature)
 
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        suite.addTest(loader.loadTestsFromTestCase(FailWithoutFeature))
 
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    tests.multiply_tests(standard_tests, scenarios, suite)
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    return suite
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class _CompiledBencodeFeature(tests.Feature):
 
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    def _probe(self):
 
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        try:
 
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            import bzrlib._bencode_pyx
 
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        except ImportError:
 
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            return False
 
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        return True
 
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    def feature_name(self):
 
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        return 'bzrlib._bencode_pyx'
 
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CompiledBencodeFeature = _CompiledBencodeFeature()
 
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class TestBencodeDecode(tests.TestCase):
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    module = None
 
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    bencode = None
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    def _check(self, expected, source):
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        self.assertEquals(expected, self.module.bdecode(source))
 
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        self.assertEquals(expected, self.bencode.bdecode(source))
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    def _run_check_error(self, exc, bad):
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        """Check that bdecoding a string raises a particular exception."""
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        self.assertRaises(exc, self.module.bdecode, bad)
 
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        self.assertRaises(exc, self.bencode.bdecode, bad)
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    def test_int(self):
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        self._check(0, 'i0e')
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        self._check('1234567890', '10:1234567890')
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    def test_large_string(self):
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        self.assertRaises(ValueError, self.module.bdecode, "2147483639:foo")
 
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        self.assertRaises(ValueError, self.bencode.bdecode, "2147483639:foo")
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    def test_malformed_string(self):
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        self._run_check_error(ValueError, '10:x')
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                            'd8:spam.mp3d6:author5:Alice6:lengthi100000eee')
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    def test_dict_deepnested(self):
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        # The recursion here provokes CPython into emitting a warning on
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        # stderr, "maximum recursion depth exceeded in __subclasscheck__", due
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        # to running out of stack space while evaluating "except (...):" in
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        # _bencode_py.  This is harmless, so we temporarily override stderr to
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        # avoid distracting noise in the test output.
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        self.overrideAttr(sys, 'stderr', self._log_file)
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        self._run_check_error(
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            RuntimeError, ("d0:" * 10000) + 'i1e' + ("e" * 10000))
 
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        self._run_check_error(RuntimeError, ("d0:" * 10000) + 'i1e' + ("e" * 10000))
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    def test_malformed_dict(self):
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        self._run_check_error(ValueError, 'd')
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        self._run_check_error(ValueError, 'd432432432432432432:e')
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    def test_empty_string(self):
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        self.assertRaises(ValueError, self.module.bdecode, '')
 
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        self.assertRaises(ValueError, self.bencode.bdecode, '')
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    def test_junk(self):
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        self._run_check_error(ValueError, 'i6easd')
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        self._run_check_error(ValueError, 'leanfdldjfh')
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    def test_unknown_object(self):
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        self.assertRaises(ValueError, self.module.bdecode, 'relwjhrlewjh')
 
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        self.assertRaises(ValueError, self.bencode.bdecode, 'relwjhrlewjh')
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    def test_unsupported_type(self):
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        self._run_check_error(TypeError, float(1.5))
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        self._run_check_error(TypeError, u"ie")
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    def test_decoder_type_error(self):
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        self.assertRaises(TypeError, self.module.bdecode, 1)
 
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        self.assertRaises(TypeError, self.bencode.bdecode, 1)
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class TestBencodeEncode(tests.TestCase):
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    module = None
 
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    bencode = None
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    def _check(self, expected, source):
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        self.assertEquals(expected, self.module.bencode(source))
 
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        self.assertEquals(expected, self.bencode.bencode(source))
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    def test_int(self):
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        self._check('i4e', 4)
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        for i in range(10000):
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            l.append([])
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            l = l[0]
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        self.assertRaises(RuntimeError, self.module.bencode, 
 
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        self.assertRaises(RuntimeError, self.bencode.bencode, 
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            top)
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    def test_dict(self):
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        for i in range(10000):
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            d[''] = {}
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            d = d['']
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        self.assertRaises(RuntimeError, self.module.bencode, 
 
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        self.assertRaises(RuntimeError, self.bencode.bencode, 
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            top)
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    def test_bencached(self):
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        self._check('i3e', self.module.Bencached(self.module.bencode(3)))
 
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        self._check('i3e', self.bencode.Bencached(self.bencode.bencode(3)))
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    def test_invalid_dict(self):
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        self.assertRaises(TypeError, self.module.bencode, {1:"foo"})
 
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        self.assertRaises(TypeError, self.bencode.bencode, {1:"foo"})
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    def test_bool(self):
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        self._check('i1e', True)