Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 1 | # Copyright 2007 Google, Inc. All Rights Reserved. |
| 2 | # Licensed to PSF under a Contributor Agreement. |
| 3 | |
| 4 | """Tests for the raise statement.""" |
| 5 | |
Nick Coghlan | 1d5ccdb | 2012-05-21 23:03:30 +1000 | [diff] [blame] | 6 | from test import support |
Nick Coghlan | ab7bf21 | 2012-02-26 17:49:52 +1000 | [diff] [blame] | 7 | import re |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 8 | import sys |
| 9 | import types |
| 10 | import unittest |
| 11 | |
| 12 | |
| 13 | def get_tb(): |
| 14 | try: |
| 15 | raise OSError() |
| 16 | except: |
| 17 | return sys.exc_info()[2] |
| 18 | |
| 19 | |
Benjamin Peterson | eec3d71 | 2008-06-11 15:59:43 +0000 | [diff] [blame] | 20 | class Context: |
| 21 | def __enter__(self): |
| 22 | return self |
| 23 | def __exit__(self, exc_type, exc_value, exc_tb): |
| 24 | return True |
| 25 | |
| 26 | |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 27 | class TestRaise(unittest.TestCase): |
| 28 | def test_invalid_reraise(self): |
| 29 | try: |
| 30 | raise |
| 31 | except RuntimeError as e: |
Benjamin Peterson | 577473f | 2010-01-19 00:09:57 +0000 | [diff] [blame] | 32 | self.assertIn("No active exception", str(e)) |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 33 | else: |
| 34 | self.fail("No exception raised") |
| 35 | |
| 36 | def test_reraise(self): |
| 37 | try: |
| 38 | try: |
| 39 | raise IndexError() |
| 40 | except IndexError as e: |
| 41 | exc1 = e |
| 42 | raise |
| 43 | except IndexError as exc2: |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 44 | self.assertTrue(exc1 is exc2) |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 45 | else: |
| 46 | self.fail("No exception raised") |
| 47 | |
Benjamin Peterson | eec3d71 | 2008-06-11 15:59:43 +0000 | [diff] [blame] | 48 | def test_except_reraise(self): |
| 49 | def reraise(): |
| 50 | try: |
| 51 | raise TypeError("foo") |
| 52 | except: |
| 53 | try: |
| 54 | raise KeyError("caught") |
| 55 | except KeyError: |
| 56 | pass |
| 57 | raise |
| 58 | self.assertRaises(TypeError, reraise) |
| 59 | |
| 60 | def test_finally_reraise(self): |
| 61 | def reraise(): |
| 62 | try: |
| 63 | raise TypeError("foo") |
| 64 | except: |
| 65 | try: |
| 66 | raise KeyError("caught") |
| 67 | finally: |
| 68 | raise |
| 69 | self.assertRaises(KeyError, reraise) |
| 70 | |
| 71 | def test_nested_reraise(self): |
| 72 | def nested_reraise(): |
| 73 | raise |
| 74 | def reraise(): |
| 75 | try: |
| 76 | raise TypeError("foo") |
| 77 | except: |
| 78 | nested_reraise() |
| 79 | self.assertRaises(TypeError, reraise) |
| 80 | |
Nick Coghlan | ab7bf21 | 2012-02-26 17:49:52 +1000 | [diff] [blame] | 81 | def test_raise_from_None(self): |
| 82 | try: |
| 83 | try: |
| 84 | raise TypeError("foo") |
| 85 | except: |
| 86 | raise ValueError() from None |
| 87 | except ValueError as e: |
| 88 | self.assertTrue(isinstance(e.__context__, TypeError)) |
| 89 | self.assertIsNone(e.__cause__) |
| 90 | |
Benjamin Peterson | eec3d71 | 2008-06-11 15:59:43 +0000 | [diff] [blame] | 91 | def test_with_reraise1(self): |
| 92 | def reraise(): |
| 93 | try: |
| 94 | raise TypeError("foo") |
| 95 | except: |
| 96 | with Context(): |
| 97 | pass |
| 98 | raise |
| 99 | self.assertRaises(TypeError, reraise) |
| 100 | |
| 101 | def test_with_reraise2(self): |
| 102 | def reraise(): |
| 103 | try: |
| 104 | raise TypeError("foo") |
| 105 | except: |
| 106 | with Context(): |
| 107 | raise KeyError("caught") |
| 108 | raise |
| 109 | self.assertRaises(TypeError, reraise) |
| 110 | |
| 111 | def test_yield_reraise(self): |
| 112 | def reraise(): |
| 113 | try: |
| 114 | raise TypeError("foo") |
| 115 | except: |
| 116 | yield 1 |
| 117 | raise |
| 118 | g = reraise() |
| 119 | next(g) |
| 120 | self.assertRaises(TypeError, lambda: next(g)) |
| 121 | self.assertRaises(StopIteration, lambda: next(g)) |
| 122 | |
Collin Winter | 1966f1c | 2007-09-01 20:26:44 +0000 | [diff] [blame] | 123 | def test_erroneous_exception(self): |
| 124 | class MyException(Exception): |
| 125 | def __init__(self): |
| 126 | raise RuntimeError() |
| 127 | |
| 128 | try: |
| 129 | raise MyException |
| 130 | except RuntimeError: |
| 131 | pass |
| 132 | else: |
| 133 | self.fail("No exception raised") |
| 134 | |
Benjamin Peterson | 5afa03a | 2011-07-15 14:09:26 -0500 | [diff] [blame] | 135 | def test_new_returns_invalid_instance(self): |
| 136 | # See issue #11627. |
| 137 | class MyException(Exception): |
| 138 | def __new__(cls, *args): |
| 139 | return object() |
| 140 | |
| 141 | with self.assertRaises(TypeError): |
| 142 | raise MyException |
| 143 | |
Benjamin Peterson | 2f8dfcd | 2011-10-27 08:20:01 -0400 | [diff] [blame] | 144 | def test_assert_with_tuple_arg(self): |
| 145 | try: |
| 146 | assert False, (3,) |
| 147 | except AssertionError as e: |
| 148 | self.assertEqual(str(e), "(3,)") |
| 149 | |
| 150 | |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 151 | |
| 152 | class TestCause(unittest.TestCase): |
Nick Coghlan | ab7bf21 | 2012-02-26 17:49:52 +1000 | [diff] [blame] | 153 | |
| 154 | def testCauseSyntax(self): |
| 155 | try: |
| 156 | try: |
| 157 | try: |
| 158 | raise TypeError |
| 159 | except Exception: |
| 160 | raise ValueError from None |
| 161 | except ValueError as exc: |
| 162 | self.assertIsNone(exc.__cause__) |
Benjamin Peterson | d5a1c44 | 2012-05-14 22:09:31 -0700 | [diff] [blame] | 163 | self.assertTrue(exc.__suppress_context__) |
| 164 | exc.__suppress_context__ = False |
| 165 | raise exc |
Nick Coghlan | ab7bf21 | 2012-02-26 17:49:52 +1000 | [diff] [blame] | 166 | except ValueError as exc: |
| 167 | e = exc |
| 168 | |
Benjamin Peterson | d5a1c44 | 2012-05-14 22:09:31 -0700 | [diff] [blame] | 169 | self.assertIsNone(e.__cause__) |
| 170 | self.assertFalse(e.__suppress_context__) |
Nick Coghlan | ab7bf21 | 2012-02-26 17:49:52 +1000 | [diff] [blame] | 171 | self.assertIsInstance(e.__context__, TypeError) |
| 172 | |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 173 | def test_invalid_cause(self): |
| 174 | try: |
| 175 | raise IndexError from 5 |
| 176 | except TypeError as e: |
Benjamin Peterson | 577473f | 2010-01-19 00:09:57 +0000 | [diff] [blame] | 177 | self.assertIn("exception cause", str(e)) |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 178 | else: |
| 179 | self.fail("No exception raised") |
| 180 | |
| 181 | def test_class_cause(self): |
| 182 | try: |
| 183 | raise IndexError from KeyError |
| 184 | except IndexError as e: |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 185 | self.assertIsInstance(e.__cause__, KeyError) |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 186 | else: |
| 187 | self.fail("No exception raised") |
| 188 | |
| 189 | def test_instance_cause(self): |
| 190 | cause = KeyError() |
| 191 | try: |
| 192 | raise IndexError from cause |
| 193 | except IndexError as e: |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 194 | self.assertTrue(e.__cause__ is cause) |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 195 | else: |
| 196 | self.fail("No exception raised") |
| 197 | |
Collin Winter | 1966f1c | 2007-09-01 20:26:44 +0000 | [diff] [blame] | 198 | def test_erroneous_cause(self): |
| 199 | class MyException(Exception): |
| 200 | def __init__(self): |
| 201 | raise RuntimeError() |
| 202 | |
| 203 | try: |
| 204 | raise IndexError from MyException |
| 205 | except RuntimeError: |
| 206 | pass |
| 207 | else: |
| 208 | self.fail("No exception raised") |
| 209 | |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 210 | |
| 211 | class TestTraceback(unittest.TestCase): |
Nick Coghlan | ab7bf21 | 2012-02-26 17:49:52 +1000 | [diff] [blame] | 212 | |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 213 | def test_sets_traceback(self): |
| 214 | try: |
| 215 | raise IndexError() |
| 216 | except IndexError as e: |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 217 | self.assertIsInstance(e.__traceback__, types.TracebackType) |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 218 | else: |
| 219 | self.fail("No exception raised") |
| 220 | |
| 221 | def test_accepts_traceback(self): |
| 222 | tb = get_tb() |
| 223 | try: |
| 224 | raise IndexError().with_traceback(tb) |
| 225 | except IndexError as e: |
| 226 | self.assertNotEqual(e.__traceback__, tb) |
| 227 | self.assertEqual(e.__traceback__.tb_next, tb) |
| 228 | else: |
| 229 | self.fail("No exception raised") |
| 230 | |
| 231 | |
Guido van Rossum | b4fb6e4 | 2008-06-14 20:20:24 +0000 | [diff] [blame] | 232 | class TestContext(unittest.TestCase): |
| 233 | def test_instance_context_instance_raise(self): |
| 234 | context = IndexError() |
| 235 | try: |
| 236 | try: |
| 237 | raise context |
| 238 | except: |
| 239 | raise OSError() |
| 240 | except OSError as e: |
| 241 | self.assertEqual(e.__context__, context) |
| 242 | else: |
| 243 | self.fail("No exception raised") |
| 244 | |
| 245 | def test_class_context_instance_raise(self): |
| 246 | context = IndexError |
| 247 | try: |
| 248 | try: |
| 249 | raise context |
| 250 | except: |
| 251 | raise OSError() |
| 252 | except OSError as e: |
| 253 | self.assertNotEqual(e.__context__, context) |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 254 | self.assertIsInstance(e.__context__, context) |
Guido van Rossum | b4fb6e4 | 2008-06-14 20:20:24 +0000 | [diff] [blame] | 255 | else: |
| 256 | self.fail("No exception raised") |
| 257 | |
| 258 | def test_class_context_class_raise(self): |
| 259 | context = IndexError |
| 260 | try: |
| 261 | try: |
| 262 | raise context |
| 263 | except: |
| 264 | raise OSError |
| 265 | except OSError as e: |
| 266 | self.assertNotEqual(e.__context__, context) |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 267 | self.assertIsInstance(e.__context__, context) |
Guido van Rossum | b4fb6e4 | 2008-06-14 20:20:24 +0000 | [diff] [blame] | 268 | else: |
| 269 | self.fail("No exception raised") |
| 270 | |
| 271 | def test_c_exception_context(self): |
| 272 | try: |
| 273 | try: |
| 274 | 1/0 |
| 275 | except: |
| 276 | raise OSError |
| 277 | except OSError as e: |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 278 | self.assertIsInstance(e.__context__, ZeroDivisionError) |
Guido van Rossum | b4fb6e4 | 2008-06-14 20:20:24 +0000 | [diff] [blame] | 279 | else: |
| 280 | self.fail("No exception raised") |
| 281 | |
| 282 | def test_c_exception_raise(self): |
| 283 | try: |
| 284 | try: |
| 285 | 1/0 |
| 286 | except: |
| 287 | xyzzy |
| 288 | except NameError as e: |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 289 | self.assertIsInstance(e.__context__, ZeroDivisionError) |
Guido van Rossum | b4fb6e4 | 2008-06-14 20:20:24 +0000 | [diff] [blame] | 290 | else: |
| 291 | self.fail("No exception raised") |
| 292 | |
| 293 | def test_noraise_finally(self): |
| 294 | try: |
| 295 | try: |
| 296 | pass |
| 297 | finally: |
| 298 | raise OSError |
| 299 | except OSError as e: |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 300 | self.assertTrue(e.__context__ is None) |
Guido van Rossum | b4fb6e4 | 2008-06-14 20:20:24 +0000 | [diff] [blame] | 301 | else: |
| 302 | self.fail("No exception raised") |
| 303 | |
| 304 | def test_raise_finally(self): |
| 305 | try: |
| 306 | try: |
| 307 | 1/0 |
| 308 | finally: |
| 309 | raise OSError |
| 310 | except OSError as e: |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 311 | self.assertIsInstance(e.__context__, ZeroDivisionError) |
Guido van Rossum | b4fb6e4 | 2008-06-14 20:20:24 +0000 | [diff] [blame] | 312 | else: |
| 313 | self.fail("No exception raised") |
| 314 | |
| 315 | def test_context_manager(self): |
| 316 | class ContextManager: |
| 317 | def __enter__(self): |
| 318 | pass |
| 319 | def __exit__(self, t, v, tb): |
| 320 | xyzzy |
| 321 | try: |
| 322 | with ContextManager(): |
| 323 | 1/0 |
| 324 | except NameError as e: |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 325 | self.assertIsInstance(e.__context__, ZeroDivisionError) |
Guido van Rossum | b4fb6e4 | 2008-06-14 20:20:24 +0000 | [diff] [blame] | 326 | else: |
| 327 | self.fail("No exception raised") |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 328 | |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 329 | def test_cycle_broken(self): |
| 330 | # Self-cycles (when re-raising a caught exception) are broken |
| 331 | try: |
| 332 | try: |
| 333 | 1/0 |
| 334 | except ZeroDivisionError as e: |
| 335 | raise e |
| 336 | except ZeroDivisionError as e: |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 337 | self.assertTrue(e.__context__ is None, e.__context__) |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 338 | |
| 339 | def test_reraise_cycle_broken(self): |
| 340 | # Non-trivial context cycles (through re-raising a previous exception) |
| 341 | # are broken too. |
| 342 | try: |
| 343 | try: |
| 344 | xyzzy |
| 345 | except NameError as a: |
| 346 | try: |
| 347 | 1/0 |
| 348 | except ZeroDivisionError: |
| 349 | raise a |
| 350 | except NameError as e: |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 351 | self.assertTrue(e.__context__.__context__ is None) |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 352 | |
Benjamin Peterson | 9b67602 | 2008-08-21 17:00:40 +0000 | [diff] [blame] | 353 | def test_3118(self): |
| 354 | # deleting the generator caused the __context__ to be cleared |
| 355 | def gen(): |
| 356 | try: |
| 357 | yield 1 |
| 358 | finally: |
| 359 | pass |
| 360 | |
| 361 | def f(): |
| 362 | g = gen() |
| 363 | next(g) |
| 364 | try: |
| 365 | try: |
| 366 | raise ValueError |
| 367 | except: |
| 368 | del g |
| 369 | raise KeyError |
| 370 | except Exception as e: |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 371 | self.assertIsInstance(e.__context__, ValueError) |
Benjamin Peterson | 9b67602 | 2008-08-21 17:00:40 +0000 | [diff] [blame] | 372 | |
| 373 | f() |
| 374 | |
Amaury Forgeot d'Arc | db26f7c | 2008-08-29 07:13:32 +0000 | [diff] [blame] | 375 | def test_3611(self): |
| 376 | # A re-raised exception in a __del__ caused the __context__ |
| 377 | # to be cleared |
| 378 | class C: |
| 379 | def __del__(self): |
| 380 | try: |
| 381 | 1/0 |
| 382 | except: |
| 383 | raise |
| 384 | |
| 385 | def f(): |
| 386 | x = C() |
| 387 | try: |
| 388 | try: |
| 389 | x.x |
| 390 | except AttributeError: |
| 391 | del x |
| 392 | raise TypeError |
| 393 | except Exception as e: |
| 394 | self.assertNotEqual(e.__context__, None) |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 395 | self.assertIsInstance(e.__context__, AttributeError) |
Amaury Forgeot d'Arc | db26f7c | 2008-08-29 07:13:32 +0000 | [diff] [blame] | 396 | |
| 397 | with support.captured_output("stderr"): |
| 398 | f() |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 399 | |
| 400 | class TestRemovedFunctionality(unittest.TestCase): |
| 401 | def test_tuples(self): |
| 402 | try: |
| 403 | raise (IndexError, KeyError) # This should be a tuple! |
| 404 | except TypeError: |
| 405 | pass |
| 406 | else: |
| 407 | self.fail("No exception raised") |
| 408 | |
| 409 | def test_strings(self): |
| 410 | try: |
| 411 | raise "foo" |
| 412 | except TypeError: |
| 413 | pass |
| 414 | else: |
| 415 | self.fail("No exception raised") |
| 416 | |
| 417 | |
| 418 | def test_main(): |
Benjamin Peterson | ee8712c | 2008-05-20 21:35:26 +0000 | [diff] [blame] | 419 | support.run_unittest(__name__) |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 420 | |
Collin Winter | 828f04a | 2007-08-31 00:04:24 +0000 | [diff] [blame] | 421 | if __name__ == "__main__": |
| 422 | unittest.main() |