| Guido van Rossum | 581cb93 | 2003-02-06 17:52:15 +0000 | [diff] [blame^] | 1 | """Unit tests for the copy module.""" |
| 2 | |
| 3 | import sys |
| 4 | import copy |
| 5 | |
| 6 | import unittest |
| 7 | from test import test_support |
| 8 | |
| 9 | class TestCopy(unittest.TestCase): |
| 10 | |
| 11 | # Attempt full line coverage of copy.py from top to bottom |
| 12 | |
| 13 | def test_exceptions(self): |
| 14 | self.assert_(copy.Error is copy.error) |
| 15 | self.assert_(issubclass(copy.Error, Exception)) |
| 16 | |
| 17 | # The copy() method |
| 18 | |
| 19 | def test_copy_basic(self): |
| 20 | x = 42 |
| 21 | y = copy.copy(x) |
| 22 | self.assertEqual(x, y) |
| 23 | |
| 24 | def test_copy_copy(self): |
| 25 | class C(object): |
| 26 | def __init__(self, foo): |
| 27 | self.foo = foo |
| 28 | def __copy__(self): |
| 29 | return C(self.foo) |
| 30 | x = C(42) |
| 31 | y = copy.copy(x) |
| 32 | self.assertEqual(y.__class__, x.__class__) |
| 33 | self.assertEqual(y.foo, x.foo) |
| 34 | |
| 35 | def test_copy_reduce(self): |
| 36 | class C(object): |
| 37 | def __reduce__(self): |
| 38 | return "" |
| 39 | x = C() |
| 40 | y = copy.copy(x) |
| 41 | self.assert_(y is x) |
| 42 | |
| 43 | def test_copy_cant(self): |
| 44 | class C(object): |
| 45 | def __getattribute__(self, name): |
| 46 | if name == "__reduce__": |
| 47 | raise AttributeError, name |
| 48 | return object.__getattribute__(self, name) |
| 49 | x = C() |
| 50 | self.assertRaises(copy.Error, copy.copy, x) |
| 51 | |
| 52 | # Type-specific _copy_xxx() methods |
| 53 | |
| 54 | def test_copy_atomic(self): |
| 55 | class Classic: |
| 56 | pass |
| 57 | class NewStyle(object): |
| 58 | pass |
| 59 | def f(): |
| 60 | pass |
| 61 | tests = [None, 42, 2L**100, 3.14, True, False, 1j, |
| 62 | "hello", u"hello\u1234", f.func_code, |
| 63 | NewStyle, xrange(10), Classic] |
| 64 | for x in tests: |
| 65 | self.assert_(copy.copy(x) is x, `x`) |
| 66 | |
| 67 | def test_copy_list(self): |
| 68 | x = [1, 2, 3] |
| 69 | self.assertEqual(copy.copy(x), x) |
| 70 | |
| 71 | def test_copy_tuple(self): |
| 72 | x = (1, 2, 3) |
| 73 | self.assertEqual(copy.copy(x), x) |
| 74 | |
| 75 | def test_copy_dict(self): |
| 76 | x = {"foo": 1, "bar": 2} |
| 77 | self.assertEqual(copy.copy(x), x) |
| 78 | |
| 79 | def test_copy_inst_vanilla(self): |
| 80 | class C: |
| 81 | def __init__(self, foo): |
| 82 | self.foo = foo |
| 83 | def __cmp__(self, other): |
| 84 | return cmp(self.foo, other.foo) |
| 85 | x = C(42) |
| 86 | self.assertEqual(copy.copy(x), x) |
| 87 | |
| 88 | def test_copy_inst_copy(self): |
| 89 | class C: |
| 90 | def __init__(self, foo): |
| 91 | self.foo = foo |
| 92 | def __copy__(self): |
| 93 | return C(self.foo) |
| 94 | def __cmp__(self, other): |
| 95 | return cmp(self.foo, other.foo) |
| 96 | x = C(42) |
| 97 | self.assertEqual(copy.copy(x), x) |
| 98 | |
| 99 | def test_copy_inst_getinitargs(self): |
| 100 | class C: |
| 101 | def __init__(self, foo): |
| 102 | self.foo = foo |
| 103 | def __getinitargs__(self): |
| 104 | return (self.foo,) |
| 105 | def __cmp__(self, other): |
| 106 | return cmp(self.foo, other.foo) |
| 107 | x = C(42) |
| 108 | self.assertEqual(copy.copy(x), x) |
| 109 | |
| 110 | def test_copy_inst_getstate(self): |
| 111 | class C: |
| 112 | def __init__(self, foo): |
| 113 | self.foo = foo |
| 114 | def __getstate__(self): |
| 115 | return {"foo": self.foo} |
| 116 | def __cmp__(self, other): |
| 117 | return cmp(self.foo, other.foo) |
| 118 | x = C(42) |
| 119 | self.assertEqual(copy.copy(x), x) |
| 120 | |
| 121 | def test_copy_inst_setstate(self): |
| 122 | class C: |
| 123 | def __init__(self, foo): |
| 124 | self.foo = foo |
| 125 | def __setstate__(self, state): |
| 126 | self.foo = state["foo"] |
| 127 | def __cmp__(self, other): |
| 128 | return cmp(self.foo, other.foo) |
| 129 | x = C(42) |
| 130 | self.assertEqual(copy.copy(x), x) |
| 131 | |
| 132 | def test_copy_inst_getstate_setstate(self): |
| 133 | class C: |
| 134 | def __init__(self, foo): |
| 135 | self.foo = foo |
| 136 | def __getstate__(self): |
| 137 | return self.foo |
| 138 | def __setstate__(self, state): |
| 139 | self.foo = state |
| 140 | def __cmp__(self, other): |
| 141 | return cmp(self.foo, other.foo) |
| 142 | x = C(42) |
| 143 | self.assertEqual(copy.copy(x), x) |
| 144 | |
| 145 | # The deepcopy() method |
| 146 | |
| 147 | def test_deepcopy_basic(self): |
| 148 | x = 42 |
| 149 | y = copy.deepcopy(x) |
| 150 | self.assertEqual(y, x) |
| 151 | |
| 152 | def test_deepcopy_memo(self): |
| 153 | x = [] |
| 154 | x.append(x) |
| 155 | y = copy.deepcopy(x) |
| 156 | self.assertEqual(y, x) |
| 157 | self.assert_(y is not x) |
| 158 | self.assert_(y[0] is not x[0]) |
| 159 | self.assert_(y is y[0]) |
| 160 | |
| 161 | def test_deepcopy_issubclass(self): |
| 162 | # XXX Note: there's no way to test the TypeError coming out of |
| 163 | # issubclass() -- this can only happen when an extension |
| 164 | # module defines a "type" that doesn't formally inherit from |
| 165 | # type. |
| 166 | class Meta(type): |
| 167 | pass |
| 168 | class C: |
| 169 | __metaclass__ = Meta |
| 170 | self.assertEqual(copy.deepcopy(C), C) |
| 171 | |
| 172 | def test_deepcopy_deepcopy(self): |
| 173 | class C(object): |
| 174 | def __init__(self, foo): |
| 175 | self.foo = foo |
| 176 | def __deepcopy__(self, memo=None): |
| 177 | return C(self.foo) |
| 178 | x = C(42) |
| 179 | y = copy.deepcopy(x) |
| 180 | self.assertEqual(y.__class__, x.__class__) |
| 181 | self.assertEqual(y.foo, x.foo) |
| 182 | |
| 183 | def test_deepcopy_reduce(self): |
| 184 | class C(object): |
| 185 | def __reduce__(self): |
| 186 | return "" |
| 187 | x = C() |
| 188 | y = copy.deepcopy(x) |
| 189 | self.assert_(y is x) |
| 190 | |
| 191 | def test_deepcopy_cant(self): |
| 192 | class C(object): |
| 193 | def __getattribute__(self, name): |
| 194 | if name == "__reduce__": |
| 195 | raise AttributeError, name |
| 196 | return object.__getattribute__(self, name) |
| 197 | x = C() |
| 198 | self.assertRaises(copy.Error, copy.deepcopy, x) |
| 199 | |
| 200 | # Type-specific _deepcopy_xxx() methods |
| 201 | |
| 202 | def test_deepcopy_atomic(self): |
| 203 | class Classic: |
| 204 | pass |
| 205 | class NewStyle(object): |
| 206 | pass |
| 207 | def f(): |
| 208 | pass |
| 209 | tests = [None, 42, 2L**100, 3.14, True, False, 1j, |
| 210 | "hello", u"hello\u1234", f.func_code, |
| 211 | NewStyle, xrange(10)] |
| 212 | for x in tests: |
| 213 | self.assert_(copy.deepcopy(x) is x, `x`) |
| 214 | |
| 215 | def test_deepcopy_list(self): |
| 216 | x = [[1, 2], 3] |
| 217 | y = copy.deepcopy(x) |
| 218 | self.assertEqual(y, x) |
| 219 | self.assert_(x is not y) |
| 220 | self.assert_(x[0] is not y[0]) |
| 221 | |
| 222 | def test_deepcopy_tuple(self): |
| 223 | x = ([1, 2], 3) |
| 224 | y = copy.deepcopy(x) |
| 225 | self.assertEqual(y, x) |
| 226 | self.assert_(x is not y) |
| 227 | self.assert_(x[0] is not y[0]) |
| 228 | |
| 229 | def test_deepcopy_dict(self): |
| 230 | x = {"foo": [1, 2], "bar": 3} |
| 231 | y = copy.deepcopy(x) |
| 232 | self.assertEqual(y, x) |
| 233 | self.assert_(x is not y) |
| 234 | self.assert_(x["foo"] is not y["foo"]) |
| 235 | |
| 236 | def test_deepcopy_keepalive(self): |
| 237 | memo = {} |
| 238 | x = 42 |
| 239 | y = copy.deepcopy(x, memo) |
| 240 | self.assert_(memo[id(x)] is x) |
| 241 | |
| 242 | def test_deepcopy_inst_vanilla(self): |
| 243 | class C: |
| 244 | def __init__(self, foo): |
| 245 | self.foo = foo |
| 246 | def __cmp__(self, other): |
| 247 | return cmp(self.foo, other.foo) |
| 248 | x = C([42]) |
| 249 | y = copy.deepcopy(x) |
| 250 | self.assertEqual(y, x) |
| 251 | self.assert_(y.foo is not x.foo) |
| 252 | |
| 253 | def test_deepcopy_inst_deepcopy(self): |
| 254 | class C: |
| 255 | def __init__(self, foo): |
| 256 | self.foo = foo |
| 257 | def __deepcopy__(self, memo): |
| 258 | return C(copy.deepcopy(self.foo, memo)) |
| 259 | def __cmp__(self, other): |
| 260 | return cmp(self.foo, other.foo) |
| 261 | x = C([42]) |
| 262 | y = copy.deepcopy(x) |
| 263 | self.assertEqual(y, x) |
| 264 | self.assert_(y is not x) |
| 265 | self.assert_(y.foo is not x.foo) |
| 266 | |
| 267 | def test_deepcopy_inst_getinitargs(self): |
| 268 | class C: |
| 269 | def __init__(self, foo): |
| 270 | self.foo = foo |
| 271 | def __getinitargs__(self): |
| 272 | return (self.foo,) |
| 273 | def __cmp__(self, other): |
| 274 | return cmp(self.foo, other.foo) |
| 275 | x = C([42]) |
| 276 | y = copy.deepcopy(x) |
| 277 | self.assertEqual(y, x) |
| 278 | self.assert_(y is not x) |
| 279 | self.assert_(y.foo is not x.foo) |
| 280 | |
| 281 | def test_deepcopy_inst_getstate(self): |
| 282 | class C: |
| 283 | def __init__(self, foo): |
| 284 | self.foo = foo |
| 285 | def __getstate__(self): |
| 286 | return {"foo": self.foo} |
| 287 | def __cmp__(self, other): |
| 288 | return cmp(self.foo, other.foo) |
| 289 | x = C([42]) |
| 290 | y = copy.deepcopy(x) |
| 291 | self.assertEqual(y, x) |
| 292 | self.assert_(y is not x) |
| 293 | self.assert_(y.foo is not x.foo) |
| 294 | |
| 295 | def test_deepcopy_inst_setstate(self): |
| 296 | class C: |
| 297 | def __init__(self, foo): |
| 298 | self.foo = foo |
| 299 | def __setstate__(self, state): |
| 300 | self.foo = state["foo"] |
| 301 | def __cmp__(self, other): |
| 302 | return cmp(self.foo, other.foo) |
| 303 | x = C([42]) |
| 304 | y = copy.deepcopy(x) |
| 305 | self.assertEqual(y, x) |
| 306 | self.assert_(y is not x) |
| 307 | self.assert_(y.foo is not x.foo) |
| 308 | |
| 309 | def test_deepcopy_inst_getstate_setstate(self): |
| 310 | class C: |
| 311 | def __init__(self, foo): |
| 312 | self.foo = foo |
| 313 | def __getstate__(self): |
| 314 | return self.foo |
| 315 | def __setstate__(self, state): |
| 316 | self.foo = state |
| 317 | def __cmp__(self, other): |
| 318 | return cmp(self.foo, other.foo) |
| 319 | x = C([42]) |
| 320 | y = copy.deepcopy(x) |
| 321 | self.assertEqual(y, x) |
| 322 | self.assert_(y is not x) |
| 323 | self.assert_(y.foo is not x.foo) |
| 324 | |
| 325 | # _reconstruct() |
| 326 | |
| 327 | def test_reconstruct_string(self): |
| 328 | class C(object): |
| 329 | def __reduce__(self): |
| 330 | return "" |
| 331 | x = C() |
| 332 | y = copy.copy(x) |
| 333 | self.assert_(y is x) |
| 334 | y = copy.deepcopy(x) |
| 335 | self.assert_(y is x) |
| 336 | |
| 337 | def test_reconstruct_nostate(self): |
| 338 | class C(object): |
| 339 | def __reduce__(self): |
| 340 | return (C, ()) |
| 341 | x = C() |
| 342 | x.foo = 42 |
| 343 | y = copy.copy(x) |
| 344 | self.assert_(y.__class__ is x.__class__) |
| 345 | y = copy.deepcopy(x) |
| 346 | self.assert_(y.__class__ is x.__class__) |
| 347 | |
| 348 | def test_reconstruct_state(self): |
| 349 | class C(object): |
| 350 | def __reduce__(self): |
| 351 | return (C, (), self.__dict__) |
| 352 | def __cmp__(self, other): |
| 353 | return cmp(self.__dict__, other.__dict__) |
| 354 | x = C() |
| 355 | x.foo = [42] |
| 356 | y = copy.copy(x) |
| 357 | self.assertEqual(y, x) |
| 358 | y = copy.deepcopy(x) |
| 359 | self.assertEqual(y, x) |
| 360 | self.assert_(y.foo is not x.foo) |
| 361 | |
| 362 | def test_reconstruct_state_setstate(self): |
| 363 | class C(object): |
| 364 | def __reduce__(self): |
| 365 | return (C, (), self.__dict__) |
| 366 | def __setstate__(self, state): |
| 367 | self.__dict__.update(state) |
| 368 | def __cmp__(self, other): |
| 369 | return cmp(self.__dict__, other.__dict__) |
| 370 | x = C() |
| 371 | x.foo = [42] |
| 372 | y = copy.copy(x) |
| 373 | self.assertEqual(y, x) |
| 374 | y = copy.deepcopy(x) |
| 375 | self.assertEqual(y, x) |
| 376 | self.assert_(y.foo is not x.foo) |
| 377 | |
| 378 | def test_main(): |
| 379 | suite = unittest.TestSuite() |
| 380 | suite.addTest(unittest.makeSuite(TestCopy)) |
| 381 | test_support.run_suite(suite) |
| 382 | |
| 383 | if __name__ == "__main__": |
| 384 | test_main() |