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