254 lines
8.5 KiB
Python
254 lines
8.5 KiB
Python
# xml.etree test for cElementTree
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import io
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import struct
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from test import support
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from test.support.import_helper import import_fresh_module
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import types
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import unittest
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cET = import_fresh_module('xml.etree.ElementTree',
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fresh=['_elementtree'])
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cET_alias = import_fresh_module('xml.etree.cElementTree',
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fresh=['_elementtree', 'xml.etree'],
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deprecated=True)
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@unittest.skipUnless(cET, 'requires _elementtree')
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class MiscTests(unittest.TestCase):
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# Issue #8651.
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@support.bigmemtest(size=support._2G + 100, memuse=1, dry_run=False)
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def test_length_overflow(self, size):
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data = b'x' * size
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parser = cET.XMLParser()
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try:
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self.assertRaises(OverflowError, parser.feed, data)
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finally:
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data = None
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def test_del_attribute(self):
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element = cET.Element('tag')
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element.tag = 'TAG'
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with self.assertRaises(AttributeError):
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del element.tag
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self.assertEqual(element.tag, 'TAG')
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with self.assertRaises(AttributeError):
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del element.text
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self.assertIsNone(element.text)
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element.text = 'TEXT'
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with self.assertRaises(AttributeError):
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del element.text
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self.assertEqual(element.text, 'TEXT')
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with self.assertRaises(AttributeError):
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del element.tail
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self.assertIsNone(element.tail)
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element.tail = 'TAIL'
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with self.assertRaises(AttributeError):
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del element.tail
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self.assertEqual(element.tail, 'TAIL')
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with self.assertRaises(AttributeError):
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del element.attrib
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self.assertEqual(element.attrib, {})
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element.attrib = {'A': 'B', 'C': 'D'}
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with self.assertRaises(AttributeError):
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del element.attrib
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self.assertEqual(element.attrib, {'A': 'B', 'C': 'D'})
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def test_trashcan(self):
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# If this test fails, it will most likely die via segfault.
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e = root = cET.Element('root')
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for i in range(200000):
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e = cET.SubElement(e, 'x')
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del e
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del root
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support.gc_collect()
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def test_parser_ref_cycle(self):
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# bpo-31499: xmlparser_dealloc() crashed with a segmentation fault when
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# xmlparser_gc_clear() was called previously by the garbage collector,
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# when the parser was part of a reference cycle.
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def parser_ref_cycle():
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parser = cET.XMLParser()
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# Create a reference cycle using an exception to keep the frame
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# alive, so the parser will be destroyed by the garbage collector
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try:
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raise ValueError
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except ValueError as exc:
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err = exc
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# Create a parser part of reference cycle
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parser_ref_cycle()
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# Trigger an explicit garbage collection to break the reference cycle
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# and so destroy the parser
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support.gc_collect()
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def test_bpo_31728(self):
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# A crash or an assertion failure shouldn't happen, in case garbage
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# collection triggers a call to clear() or a reading of text or tail,
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# while a setter or clear() or __setstate__() is already running.
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elem = cET.Element('elem')
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class X:
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def __del__(self):
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elem.text
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elem.tail
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elem.clear()
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elem.text = X()
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elem.clear() # shouldn't crash
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elem.tail = X()
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elem.clear() # shouldn't crash
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elem.text = X()
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elem.text = X() # shouldn't crash
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elem.clear()
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elem.tail = X()
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elem.tail = X() # shouldn't crash
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elem.clear()
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elem.text = X()
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elem.__setstate__({'tag': 42}) # shouldn't cause an assertion failure
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elem.clear()
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elem.tail = X()
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elem.__setstate__({'tag': 42}) # shouldn't cause an assertion failure
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@support.cpython_only
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def test_uninitialized_parser(self):
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# The interpreter shouldn't crash in case of calling methods or
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# accessing attributes of uninitialized XMLParser objects.
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parser = cET.XMLParser.__new__(cET.XMLParser)
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self.assertRaises(ValueError, parser.close)
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self.assertRaises(ValueError, parser.feed, 'foo')
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class MockFile:
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def read(*args):
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return ''
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self.assertRaises(ValueError, parser._parse_whole, MockFile())
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self.assertRaises(ValueError, parser._setevents, None)
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self.assertIsNone(parser.entity)
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self.assertIsNone(parser.target)
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def test_setstate_leaks(self):
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# Test reference leaks
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elem = cET.Element.__new__(cET.Element)
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for i in range(100):
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elem.__setstate__({'tag': 'foo', 'attrib': {'bar': 42},
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'_children': [cET.Element('child')],
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'text': 'text goes here',
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'tail': 'opposite of head'})
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self.assertEqual(elem.tag, 'foo')
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self.assertEqual(elem.text, 'text goes here')
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self.assertEqual(elem.tail, 'opposite of head')
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self.assertEqual(list(elem.attrib.items()), [('bar', 42)])
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self.assertEqual(len(elem), 1)
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self.assertEqual(elem[0].tag, 'child')
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def test_iterparse_leaks(self):
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# Test reference leaks in TreeBuilder (issue #35502).
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# The test is written to be executed in the hunting reference leaks
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# mode.
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XML = '<a></a></b>'
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parser = cET.iterparse(io.StringIO(XML))
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next(parser)
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del parser
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support.gc_collect()
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def test_xmlpullparser_leaks(self):
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# Test reference leaks in TreeBuilder (issue #35502).
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# The test is written to be executed in the hunting reference leaks
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# mode.
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XML = '<a></a></b>'
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parser = cET.XMLPullParser()
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parser.feed(XML)
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del parser
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support.gc_collect()
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def test_dict_disappearing_during_get_item(self):
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# test fix for seg fault reported in issue 27946
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class X:
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def __hash__(self):
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e.attrib = {} # this frees e->extra->attrib
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[{i: i} for i in range(1000)] # exhaust the dict keys cache
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return 13
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e = cET.Element("elem", {1: 2})
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r = e.get(X())
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self.assertIsNone(r)
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@unittest.skipUnless(cET, 'requires _elementtree')
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class TestAliasWorking(unittest.TestCase):
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# Test that the cET alias module is alive
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def test_alias_working(self):
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e = cET_alias.Element('foo')
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self.assertEqual(e.tag, 'foo')
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@unittest.skipUnless(cET, 'requires _elementtree')
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@support.cpython_only
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class TestAcceleratorImported(unittest.TestCase):
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# Test that the C accelerator was imported, as expected
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def test_correct_import_cET(self):
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# SubElement is a function so it retains _elementtree as its module.
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self.assertEqual(cET.SubElement.__module__, '_elementtree')
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def test_correct_import_cET_alias(self):
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self.assertEqual(cET_alias.SubElement.__module__, '_elementtree')
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def test_parser_comes_from_C(self):
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# The type of methods defined in Python code is types.FunctionType,
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# while the type of methods defined inside _elementtree is
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# <class 'wrapper_descriptor'>
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self.assertNotIsInstance(cET.Element.__init__, types.FunctionType)
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@unittest.skipUnless(cET, 'requires _elementtree')
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@support.cpython_only
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class SizeofTest(unittest.TestCase):
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def setUp(self):
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self.elementsize = support.calcobjsize('5P')
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# extra
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self.extra = struct.calcsize('PnnP4P')
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check_sizeof = support.check_sizeof
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def test_element(self):
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e = cET.Element('a')
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self.check_sizeof(e, self.elementsize)
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def test_element_with_attrib(self):
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e = cET.Element('a', href='about:')
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self.check_sizeof(e, self.elementsize + self.extra)
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def test_element_with_children(self):
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e = cET.Element('a')
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for i in range(5):
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cET.SubElement(e, 'span')
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# should have space for 8 children now
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self.check_sizeof(e, self.elementsize + self.extra +
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struct.calcsize('8P'))
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def test_main():
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from test import test_xml_etree
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# Run the tests specific to the C implementation
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support.run_unittest(
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MiscTests,
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TestAliasWorking,
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TestAcceleratorImported,
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SizeofTest,
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)
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# Run the same test suite as the Python module
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test_xml_etree.test_main(module=cET)
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if __name__ == '__main__':
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test_main()
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