1# xml.etree test for cElementTree
2import struct
3from test import support
4from test.support import import_fresh_module
5import types
6import unittest
7
8cET = import_fresh_module('xml.etree.ElementTree',
9                          fresh=['_elementtree'])
10cET_alias = import_fresh_module('xml.etree.cElementTree',
11                                fresh=['_elementtree', 'xml.etree'])
12
13
14@unittest.skipUnless(cET, 'requires _elementtree')
15class MiscTests(unittest.TestCase):
16    # Issue #8651.
17    @support.bigmemtest(size=support._2G + 100, memuse=1, dry_run=False)
18    def test_length_overflow(self, size):
19        data = b'x' * size
20        parser = cET.XMLParser()
21        try:
22            self.assertRaises(OverflowError, parser.feed, data)
23        finally:
24            data = None
25
26    def test_del_attribute(self):
27        element = cET.Element('tag')
28
29        element.tag = 'TAG'
30        with self.assertRaises(AttributeError):
31            del element.tag
32        self.assertEqual(element.tag, 'TAG')
33
34        with self.assertRaises(AttributeError):
35            del element.text
36        self.assertIsNone(element.text)
37        element.text = 'TEXT'
38        with self.assertRaises(AttributeError):
39            del element.text
40        self.assertEqual(element.text, 'TEXT')
41
42        with self.assertRaises(AttributeError):
43            del element.tail
44        self.assertIsNone(element.tail)
45        element.tail = 'TAIL'
46        with self.assertRaises(AttributeError):
47            del element.tail
48        self.assertEqual(element.tail, 'TAIL')
49
50        with self.assertRaises(AttributeError):
51            del element.attrib
52        self.assertEqual(element.attrib, {})
53        element.attrib = {'A': 'B', 'C': 'D'}
54        with self.assertRaises(AttributeError):
55            del element.attrib
56        self.assertEqual(element.attrib, {'A': 'B', 'C': 'D'})
57
58    def test_trashcan(self):
59        # If this test fails, it will most likely die via segfault.
60        e = root = cET.Element('root')
61        for i in range(200000):
62            e = cET.SubElement(e, 'x')
63        del e
64        del root
65        support.gc_collect()
66
67
68@unittest.skipUnless(cET, 'requires _elementtree')
69class TestAliasWorking(unittest.TestCase):
70    # Test that the cET alias module is alive
71    def test_alias_working(self):
72        e = cET_alias.Element('foo')
73        self.assertEqual(e.tag, 'foo')
74
75
76@unittest.skipUnless(cET, 'requires _elementtree')
77@support.cpython_only
78class TestAcceleratorImported(unittest.TestCase):
79    # Test that the C accelerator was imported, as expected
80    def test_correct_import_cET(self):
81        # SubElement is a function so it retains _elementtree as its module.
82        self.assertEqual(cET.SubElement.__module__, '_elementtree')
83
84    def test_correct_import_cET_alias(self):
85        self.assertEqual(cET_alias.SubElement.__module__, '_elementtree')
86
87    def test_parser_comes_from_C(self):
88        # The type of methods defined in Python code is types.FunctionType,
89        # while the type of methods defined inside _elementtree is
90        # <class 'wrapper_descriptor'>
91        self.assertNotIsInstance(cET.Element.__init__, types.FunctionType)
92
93
94@unittest.skipUnless(cET, 'requires _elementtree')
95@support.cpython_only
96class SizeofTest(unittest.TestCase):
97    def setUp(self):
98        self.elementsize = support.calcobjsize('5P')
99        # extra
100        self.extra = struct.calcsize('PnnP4P')
101
102    check_sizeof = support.check_sizeof
103
104    def test_element(self):
105        e = cET.Element('a')
106        self.check_sizeof(e, self.elementsize)
107
108    def test_element_with_attrib(self):
109        e = cET.Element('a', href='about:')
110        self.check_sizeof(e, self.elementsize + self.extra)
111
112    def test_element_with_children(self):
113        e = cET.Element('a')
114        for i in range(5):
115            cET.SubElement(e, 'span')
116        # should have space for 8 children now
117        self.check_sizeof(e, self.elementsize + self.extra +
118                             struct.calcsize('8P'))
119
120def test_main():
121    from test import test_xml_etree
122
123    # Run the tests specific to the C implementation
124    support.run_unittest(
125        MiscTests,
126        TestAliasWorking,
127        TestAcceleratorImported,
128        SizeofTest,
129        )
130
131    # Run the same test suite as the Python module
132    test_xml_etree.test_main(module=cET)
133
134
135if __name__ == '__main__':
136    test_main()
137