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# xml.etree test for cElementTree
import struct
from test import support
from test.support 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
@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 test_main():
from test import test_xml_etree
# Run the tests specific to the C implementation
support.run_unittest(
MiscTests,
TestAliasWorking,
TestAcceleratorImported,
SizeofTest,
)
# Run the same test suite as the Python module
test_xml_etree.test_main(module=cET)
if __name__ == '__main__':
test_main()
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