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# xml.etree test for cElementTree

from test import test_support
from test.test_support import precisionbigmemtest, _2G
import unittest

cET = test_support.import_module('xml.etree.cElementTree')


# cElementTree specific tests

def sanity():
    """
    Import sanity.

    >>> from xml.etree import cElementTree
    """


class MiscTests(unittest.TestCase):
    # Issue #8651.
    @precisionbigmemtest(size=_2G + 100, memuse=1)
    def test_length_overflow(self, size):
        if size < _2G + 100:
            self.skipTest("not enough free memory, need at least 2 GB")
        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_main():
    from test import test_xml_etree, test_xml_etree_c

    # Run the tests specific to the C implementation
    test_support.run_doctest(test_xml_etree_c, verbosity=True)

    # Assign the C implementation before running the doctests
    # Patch the __name__, to prevent confusion with the pure Python test
    pyET = test_xml_etree.ET
    py__name__ = test_xml_etree.__name__
    test_xml_etree.ET = cET
    if __name__ != '__main__':
        test_xml_etree.__name__ = __name__
    try:
        # Run the same test suite as xml.etree.ElementTree
        test_xml_etree.test_main(module_name='xml.etree.cElementTree')
    finally:
        test_xml_etree.ET = pyET
        test_xml_etree.__name__ = py__name__

if __name__ == '__main__':
    test_main()