419 lines
11 KiB
Python
419 lines
11 KiB
Python
# Copyright 2007 Google, Inc. All Rights Reserved.
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# Licensed to PSF under a Contributor Agreement.
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"""Tests for the raise statement."""
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from test import support
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import sys
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import types
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import unittest
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def get_tb():
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try:
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raise OSError()
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except:
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return sys.exc_info()[2]
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class Context:
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, exc_tb):
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return True
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class TestRaise(unittest.TestCase):
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def test_invalid_reraise(self):
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try:
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raise
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except RuntimeError as e:
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self.assertIn("No active exception", str(e))
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else:
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self.fail("No exception raised")
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def test_reraise(self):
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try:
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try:
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raise IndexError()
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except IndexError as e:
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exc1 = e
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raise
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except IndexError as exc2:
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self.assertTrue(exc1 is exc2)
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else:
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self.fail("No exception raised")
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def test_except_reraise(self):
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def reraise():
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try:
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raise TypeError("foo")
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except:
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try:
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raise KeyError("caught")
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except KeyError:
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pass
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raise
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self.assertRaises(TypeError, reraise)
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def test_finally_reraise(self):
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def reraise():
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try:
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raise TypeError("foo")
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except:
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try:
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raise KeyError("caught")
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finally:
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raise
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self.assertRaises(KeyError, reraise)
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def test_nested_reraise(self):
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def nested_reraise():
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raise
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def reraise():
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try:
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raise TypeError("foo")
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except:
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nested_reraise()
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self.assertRaises(TypeError, reraise)
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def test_raise_from_None(self):
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try:
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try:
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raise TypeError("foo")
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except:
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raise ValueError() from None
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except ValueError as e:
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self.assertTrue(isinstance(e.__context__, TypeError))
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self.assertIsNone(e.__cause__)
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def test_with_reraise1(self):
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def reraise():
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try:
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raise TypeError("foo")
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except:
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with Context():
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pass
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raise
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self.assertRaises(TypeError, reraise)
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def test_with_reraise2(self):
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def reraise():
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try:
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raise TypeError("foo")
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except:
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with Context():
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raise KeyError("caught")
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raise
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self.assertRaises(TypeError, reraise)
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def test_yield_reraise(self):
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def reraise():
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try:
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raise TypeError("foo")
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except:
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yield 1
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raise
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g = reraise()
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next(g)
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self.assertRaises(TypeError, lambda: next(g))
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self.assertRaises(StopIteration, lambda: next(g))
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def test_erroneous_exception(self):
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class MyException(Exception):
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def __init__(self):
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raise RuntimeError()
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try:
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raise MyException
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except RuntimeError:
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pass
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else:
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self.fail("No exception raised")
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def test_new_returns_invalid_instance(self):
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# See issue #11627.
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class MyException(Exception):
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def __new__(cls, *args):
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return object()
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with self.assertRaises(TypeError):
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raise MyException
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def test_assert_with_tuple_arg(self):
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try:
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assert False, (3,)
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except AssertionError as e:
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self.assertEqual(str(e), "(3,)")
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class TestCause(unittest.TestCase):
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def testCauseSyntax(self):
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try:
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try:
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try:
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raise TypeError
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except Exception:
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raise ValueError from None
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except ValueError as exc:
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self.assertIsNone(exc.__cause__)
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self.assertTrue(exc.__suppress_context__)
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exc.__suppress_context__ = False
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raise exc
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except ValueError as exc:
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e = exc
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self.assertIsNone(e.__cause__)
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self.assertFalse(e.__suppress_context__)
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self.assertIsInstance(e.__context__, TypeError)
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def test_invalid_cause(self):
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try:
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raise IndexError from 5
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except TypeError as e:
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self.assertIn("exception cause", str(e))
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else:
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self.fail("No exception raised")
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def test_class_cause(self):
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try:
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raise IndexError from KeyError
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except IndexError as e:
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self.assertIsInstance(e.__cause__, KeyError)
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else:
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self.fail("No exception raised")
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def test_instance_cause(self):
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cause = KeyError()
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try:
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raise IndexError from cause
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except IndexError as e:
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self.assertTrue(e.__cause__ is cause)
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else:
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self.fail("No exception raised")
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def test_erroneous_cause(self):
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class MyException(Exception):
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def __init__(self):
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raise RuntimeError()
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try:
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raise IndexError from MyException
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except RuntimeError:
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pass
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else:
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self.fail("No exception raised")
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class TestTraceback(unittest.TestCase):
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def test_sets_traceback(self):
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try:
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raise IndexError()
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except IndexError as e:
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self.assertIsInstance(e.__traceback__, types.TracebackType)
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else:
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self.fail("No exception raised")
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def test_accepts_traceback(self):
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tb = get_tb()
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try:
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raise IndexError().with_traceback(tb)
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except IndexError as e:
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self.assertNotEqual(e.__traceback__, tb)
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self.assertEqual(e.__traceback__.tb_next, tb)
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else:
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self.fail("No exception raised")
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class TestContext(unittest.TestCase):
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def test_instance_context_instance_raise(self):
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context = IndexError()
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try:
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try:
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raise context
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except:
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raise OSError()
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except OSError as e:
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self.assertEqual(e.__context__, context)
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else:
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self.fail("No exception raised")
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def test_class_context_instance_raise(self):
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context = IndexError
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try:
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try:
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raise context
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except:
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raise OSError()
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except OSError as e:
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self.assertNotEqual(e.__context__, context)
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self.assertIsInstance(e.__context__, context)
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else:
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self.fail("No exception raised")
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def test_class_context_class_raise(self):
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context = IndexError
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try:
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try:
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raise context
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except:
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raise OSError
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except OSError as e:
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self.assertNotEqual(e.__context__, context)
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self.assertIsInstance(e.__context__, context)
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else:
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self.fail("No exception raised")
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def test_c_exception_context(self):
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try:
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try:
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1/0
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except:
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raise OSError
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except OSError as e:
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self.assertIsInstance(e.__context__, ZeroDivisionError)
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else:
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self.fail("No exception raised")
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def test_c_exception_raise(self):
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try:
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try:
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1/0
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except:
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xyzzy
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except NameError as e:
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self.assertIsInstance(e.__context__, ZeroDivisionError)
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else:
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self.fail("No exception raised")
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def test_noraise_finally(self):
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try:
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try:
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pass
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finally:
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raise OSError
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except OSError as e:
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self.assertTrue(e.__context__ is None)
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else:
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self.fail("No exception raised")
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def test_raise_finally(self):
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try:
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try:
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1/0
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finally:
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raise OSError
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except OSError as e:
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self.assertIsInstance(e.__context__, ZeroDivisionError)
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else:
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self.fail("No exception raised")
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def test_context_manager(self):
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class ContextManager:
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def __enter__(self):
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pass
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def __exit__(self, t, v, tb):
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xyzzy
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try:
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with ContextManager():
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1/0
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except NameError as e:
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self.assertIsInstance(e.__context__, ZeroDivisionError)
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else:
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self.fail("No exception raised")
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def test_cycle_broken(self):
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# Self-cycles (when re-raising a caught exception) are broken
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try:
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try:
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1/0
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except ZeroDivisionError as e:
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raise e
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except ZeroDivisionError as e:
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self.assertTrue(e.__context__ is None, e.__context__)
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def test_reraise_cycle_broken(self):
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# Non-trivial context cycles (through re-raising a previous exception)
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# are broken too.
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try:
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try:
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xyzzy
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except NameError as a:
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try:
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1/0
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except ZeroDivisionError:
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raise a
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except NameError as e:
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self.assertTrue(e.__context__.__context__ is None)
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def test_3118(self):
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# deleting the generator caused the __context__ to be cleared
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def gen():
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try:
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yield 1
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finally:
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pass
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def f():
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g = gen()
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next(g)
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try:
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try:
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raise ValueError
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except:
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del g
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raise KeyError
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except Exception as e:
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self.assertIsInstance(e.__context__, ValueError)
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f()
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def test_3611(self):
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# A re-raised exception in a __del__ caused the __context__
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# to be cleared
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class C:
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def __del__(self):
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try:
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1/0
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except:
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raise
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def f():
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x = C()
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try:
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try:
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x.x
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except AttributeError:
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del x
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raise TypeError
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except Exception as e:
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self.assertNotEqual(e.__context__, None)
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self.assertIsInstance(e.__context__, AttributeError)
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with support.captured_output("stderr"):
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f()
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class TestRemovedFunctionality(unittest.TestCase):
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def test_tuples(self):
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try:
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raise (IndexError, KeyError) # This should be a tuple!
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except TypeError:
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pass
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else:
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self.fail("No exception raised")
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def test_strings(self):
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try:
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raise "foo"
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except TypeError:
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pass
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else:
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self.fail("No exception raised")
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if __name__ == "__main__":
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unittest.main()
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