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| 1 | +# Copyright (c) 2018, 2019, Oracle and/or its affiliates. |
| 2 | +# Copyright (C) 1996-2017 Python Software Foundation |
| 3 | +# |
| 4 | +# Licensed under the PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2 |
| 5 | +import unittest, sys |
| 6 | + |
| 7 | + |
| 8 | +if sys.version_info.minor >= 7: |
| 9 | + class TestMROEntry(unittest.TestCase): |
| 10 | + def test_mro_entry_signature(self): |
| 11 | + tested = [] |
| 12 | + class B: ... |
| 13 | + class C: |
| 14 | + def __mro_entries__(self, *args, **kwargs): |
| 15 | + tested.extend([args, kwargs]) |
| 16 | + return (C,) |
| 17 | + c = C() |
| 18 | + self.assertEqual(tested, []) |
| 19 | + class D(B, c): ... |
| 20 | + self.assertEqual(tested[0], ((B, c),)) |
| 21 | + self.assertEqual(tested[1], {}) |
| 22 | + |
| 23 | + def test_mro_entry(self): |
| 24 | + tested = [] |
| 25 | + class A: ... |
| 26 | + class B: ... |
| 27 | + class C: |
| 28 | + def __mro_entries__(self, bases): |
| 29 | + tested.append(bases) |
| 30 | + return (self.__class__,) |
| 31 | + c = C() |
| 32 | + self.assertEqual(tested, []) |
| 33 | + class D(A, c, B): ... |
| 34 | + self.assertEqual(tested[-1], (A, c, B)) |
| 35 | + self.assertEqual(D.__bases__, (A, C, B)) |
| 36 | + self.assertEqual(D.__orig_bases__, (A, c, B)) |
| 37 | + self.assertEqual(D.__mro__, (D, A, C, B, object)) |
| 38 | + d = D() |
| 39 | + class E(d): ... |
| 40 | + self.assertEqual(tested[-1], (d,)) |
| 41 | + self.assertEqual(E.__bases__, (D,)) |
| 42 | + |
| 43 | + def test_mro_entry_none(self): |
| 44 | + tested = [] |
| 45 | + class A: ... |
| 46 | + class B: ... |
| 47 | + class C: |
| 48 | + def __mro_entries__(self, bases): |
| 49 | + tested.append(bases) |
| 50 | + return () |
| 51 | + c = C() |
| 52 | + self.assertEqual(tested, []) |
| 53 | + class D(A, c, B): ... |
| 54 | + self.assertEqual(tested[-1], (A, c, B)) |
| 55 | + self.assertEqual(D.__bases__, (A, B)) |
| 56 | + self.assertEqual(D.__orig_bases__, (A, c, B)) |
| 57 | + self.assertEqual(D.__mro__, (D, A, B, object)) |
| 58 | + class E(c): ... |
| 59 | + self.assertEqual(tested[-1], (c,)) |
| 60 | + self.assertEqual(E.__bases__, (object,)) |
| 61 | + self.assertEqual(E.__orig_bases__, (c,)) |
| 62 | + self.assertEqual(E.__mro__, (E, object)) |
| 63 | + |
| 64 | + def test_mro_entry_with_builtins(self): |
| 65 | + tested = [] |
| 66 | + class A: ... |
| 67 | + class C: |
| 68 | + def __mro_entries__(self, bases): |
| 69 | + tested.append(bases) |
| 70 | + return (dict,) |
| 71 | + c = C() |
| 72 | + self.assertEqual(tested, []) |
| 73 | + class D(A, c): ... |
| 74 | + self.assertEqual(tested[-1], (A, c)) |
| 75 | + self.assertEqual(D.__bases__, (A, dict)) |
| 76 | + self.assertEqual(D.__orig_bases__, (A, c)) |
| 77 | + self.assertEqual(D.__mro__, (D, A, dict, object)) |
| 78 | + |
| 79 | + def test_mro_entry_with_builtins_2(self): |
| 80 | + tested = [] |
| 81 | + class C: |
| 82 | + def __mro_entries__(self, bases): |
| 83 | + tested.append(bases) |
| 84 | + return (C,) |
| 85 | + c = C() |
| 86 | + self.assertEqual(tested, []) |
| 87 | + class D(c, dict): ... |
| 88 | + self.assertEqual(tested[-1], (c, dict)) |
| 89 | + self.assertEqual(D.__bases__, (C, dict)) |
| 90 | + self.assertEqual(D.__orig_bases__, (c, dict)) |
| 91 | + self.assertEqual(D.__mro__, (D, C, dict, object)) |
| 92 | + |
| 93 | + def test_mro_entry_errors(self): |
| 94 | + class C_too_many: |
| 95 | + def __mro_entries__(self, bases, something, other): |
| 96 | + return () |
| 97 | + c = C_too_many() |
| 98 | + with self.assertRaises(TypeError): |
| 99 | + class D(c): ... |
| 100 | + class C_too_few: |
| 101 | + def __mro_entries__(self): |
| 102 | + return () |
| 103 | + d = C_too_few() |
| 104 | + with self.assertRaises(TypeError): |
| 105 | + class D(d): ... |
| 106 | + |
| 107 | + def test_mro_entry_errors_2(self): |
| 108 | + class C_not_callable: |
| 109 | + __mro_entries__ = "Surprise!" |
| 110 | + c = C_not_callable() |
| 111 | + with self.assertRaises(TypeError): |
| 112 | + class D(c): ... |
| 113 | + class C_not_tuple: |
| 114 | + def __mro_entries__(self): |
| 115 | + return object |
| 116 | + c = C_not_tuple() |
| 117 | + with self.assertRaises(TypeError): |
| 118 | + class D(c): ... |
| 119 | + |
| 120 | + def test_mro_entry_metaclass(self): |
| 121 | + meta_args = [] |
| 122 | + class Meta(type): |
| 123 | + def __new__(mcls, name, bases, ns): |
| 124 | + meta_args.extend([mcls, name, bases, ns]) |
| 125 | + return super().__new__(mcls, name, bases, ns) |
| 126 | + class A: ... |
| 127 | + class C: |
| 128 | + def __mro_entries__(self, bases): |
| 129 | + return (A,) |
| 130 | + c = C() |
| 131 | + class D(c, metaclass=Meta): |
| 132 | + x = 1 |
| 133 | + self.assertEqual(meta_args[0], Meta) |
| 134 | + self.assertEqual(meta_args[1], 'D') |
| 135 | + self.assertEqual(meta_args[2], (A,)) |
| 136 | + self.assertEqual(meta_args[3]['x'], 1) |
| 137 | + self.assertEqual(D.__bases__, (A,)) |
| 138 | + self.assertEqual(D.__orig_bases__, (c,)) |
| 139 | + self.assertEqual(D.__mro__, (D, A, object)) |
| 140 | + self.assertEqual(D.__class__, Meta) |
| 141 | + |
| 142 | + |
| 143 | + class TestClassGetitem(unittest.TestCase): |
| 144 | + def test_class_getitem(self): |
| 145 | + getitem_args = [] |
| 146 | + class C: |
| 147 | + def __class_getitem__(*args, **kwargs): |
| 148 | + getitem_args.extend([args, kwargs]) |
| 149 | + return None |
| 150 | + C[int, str] |
| 151 | + self.assertEqual(getitem_args[0], (C, (int, str))) |
| 152 | + self.assertEqual(getitem_args[1], {}) |
| 153 | + |
| 154 | + def test_class_getitem(self): |
| 155 | + class C: |
| 156 | + def __class_getitem__(cls, item): |
| 157 | + return 'C[{0}]'.format(item.__name__) |
| 158 | + self.assertEqual(C[int], 'C[int]') |
| 159 | + self.assertEqual(C[C], 'C[C]') |
| 160 | + |
| 161 | + def test_class_getitem_inheritance(self): |
| 162 | + class C: |
| 163 | + def __class_getitem__(cls, item): |
| 164 | + return '{0}[{1}]'.format(cls.__name__, item.__name__) |
| 165 | + class D(C): ... |
| 166 | + self.assertEqual(D[int], 'D[int]') |
| 167 | + self.assertEqual(D[D], 'D[D]') |
| 168 | + |
| 169 | + def test_class_getitem_inheritance_2(self): |
| 170 | + class C: |
| 171 | + def __class_getitem__(cls, item): |
| 172 | + return 'Should not see this' |
| 173 | + class D(C): |
| 174 | + def __class_getitem__(cls, item): |
| 175 | + return '{0}[{1}]'.format(cls.__name__, item.__name__) |
| 176 | + self.assertEqual(D[int], 'D[int]') |
| 177 | + self.assertEqual(D[D], 'D[D]') |
| 178 | + |
| 179 | + def test_class_getitem_classmethod(self): |
| 180 | + class C: |
| 181 | + @classmethod |
| 182 | + def __class_getitem__(cls, item): |
| 183 | + return '{0}[{1}]'.format(cls.__name__, item.__name__) |
| 184 | + class D(C): ... |
| 185 | + self.assertEqual(D[int], 'D[int]') |
| 186 | + self.assertEqual(D[D], 'D[D]') |
| 187 | + |
| 188 | + def test_class_getitem_patched(self): |
| 189 | + class C: |
| 190 | + def __init_subclass__(cls): |
| 191 | + def __class_getitem__(cls, item): |
| 192 | + return '{0}[{1}]'.format(cls.__name__, item.__name__) |
| 193 | + cls.__class_getitem__ = classmethod(__class_getitem__) |
| 194 | + class D(C): ... |
| 195 | + self.assertEqual(D[int], 'D[int]') |
| 196 | + self.assertEqual(D[D], 'D[D]') |
| 197 | + |
| 198 | + def test_class_getitem_with_builtins(self): |
| 199 | + class A(dict): |
| 200 | + called_with = None |
| 201 | + |
| 202 | + def __class_getitem__(cls, item): |
| 203 | + cls.called_with = item |
| 204 | + class B(A): |
| 205 | + pass |
| 206 | + self.assertIs(B.called_with, None) |
| 207 | + B[int] |
| 208 | + self.assertIs(B.called_with, int) |
| 209 | + |
| 210 | + def test_class_getitem_errors(self): |
| 211 | + class C_too_few: |
| 212 | + def __class_getitem__(cls): |
| 213 | + return None |
| 214 | + with self.assertRaises(TypeError): |
| 215 | + C_too_few[int] |
| 216 | + class C_too_many: |
| 217 | + def __class_getitem__(cls, one, two): |
| 218 | + return None |
| 219 | + with self.assertRaises(TypeError): |
| 220 | + C_too_many[int] |
| 221 | + |
| 222 | + def test_class_getitem_errors_2(self): |
| 223 | + class C: |
| 224 | + def __class_getitem__(cls, item): |
| 225 | + return None |
| 226 | + with self.assertRaises(TypeError): |
| 227 | + C()[int] |
| 228 | + class E: ... |
| 229 | + e = E() |
| 230 | + e.__class_getitem__ = lambda cls, item: 'This will not work' |
| 231 | + with self.assertRaises(TypeError): |
| 232 | + e[int] |
| 233 | + class C_not_callable: |
| 234 | + __class_getitem__ = "Surprise!" |
| 235 | + with self.assertRaises(TypeError): |
| 236 | + C_not_callable[int] |
| 237 | + |
| 238 | + def test_class_getitem_metaclass(self): |
| 239 | + class Meta(type): |
| 240 | + def __class_getitem__(cls, item): |
| 241 | + return '{0}[{1}]'.format(cls.__name__, item.__name__) |
| 242 | + self.assertEqual(Meta[int], 'Meta[int]') |
| 243 | + |
| 244 | + def test_class_getitem_metaclass_2(self): |
| 245 | + class Meta(type): |
| 246 | + def __getitem__(cls, item): |
| 247 | + return 'from metaclass' |
| 248 | + class C(metaclass=Meta): |
| 249 | + def __class_getitem__(cls, item): |
| 250 | + return 'from __class_getitem__' |
| 251 | + self.assertEqual(C[int], 'from metaclass') |
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