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507 lines
13 KiB
507 lines
13 KiB
3 years ago
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# 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 OSError as e:
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return e.__traceback__
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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.assertIs(exc1, 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.assertIsInstance(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.assertIs(e.__cause__, 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 TestTracebackType(unittest.TestCase):
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def raiser(self):
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raise ValueError
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def test_attrs(self):
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try:
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self.raiser()
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except Exception as exc:
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tb = exc.__traceback__
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self.assertIsInstance(tb.tb_next, types.TracebackType)
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self.assertIs(tb.tb_frame, sys._getframe())
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self.assertIsInstance(tb.tb_lasti, int)
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self.assertIsInstance(tb.tb_lineno, int)
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self.assertIs(tb.tb_next.tb_next, None)
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# Invalid assignments
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with self.assertRaises(TypeError):
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del tb.tb_next
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with self.assertRaises(TypeError):
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tb.tb_next = "asdf"
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# Loops
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with self.assertRaises(ValueError):
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tb.tb_next = tb
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with self.assertRaises(ValueError):
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tb.tb_next.tb_next = tb
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# Valid assignments
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tb.tb_next = None
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self.assertIs(tb.tb_next, None)
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new_tb = get_tb()
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tb.tb_next = new_tb
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self.assertIs(tb.tb_next, new_tb)
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def test_constructor(self):
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other_tb = get_tb()
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frame = sys._getframe()
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tb = types.TracebackType(other_tb, frame, 1, 2)
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self.assertEqual(tb.tb_next, other_tb)
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self.assertEqual(tb.tb_frame, frame)
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self.assertEqual(tb.tb_lasti, 1)
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self.assertEqual(tb.tb_lineno, 2)
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tb = types.TracebackType(None, frame, 1, 2)
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self.assertEqual(tb.tb_next, None)
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with self.assertRaises(TypeError):
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types.TracebackType("no", frame, 1, 2)
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with self.assertRaises(TypeError):
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types.TracebackType(other_tb, "no", 1, 2)
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with self.assertRaises(TypeError):
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types.TracebackType(other_tb, frame, "no", 2)
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with self.assertRaises(TypeError):
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types.TracebackType(other_tb, frame, 1, "nuh-uh")
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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.assertIs(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.assertIsNot(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.assertIsNot(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.assertIsNone(e.__context__)
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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.assertIsNone(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.assertIsNone(e.__context__.__context__)
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def test_not_last(self):
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# Context is not necessarily the last exception
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context = Exception("context")
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try:
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raise context
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except Exception:
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try:
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raise Exception("caught")
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|
except Exception:
|
||
|
|
pass
|
||
|
|
try:
|
||
|
|
raise Exception("new")
|
||
|
|
except Exception as exc:
|
||
|
|
raised = exc
|
||
|
|
self.assertIs(raised.__context__, context)
|
||
|
|
|
||
|
|
def test_3118(self):
|
||
|
|
# deleting the generator caused the __context__ to be cleared
|
||
|
|
def gen():
|
||
|
|
try:
|
||
|
|
yield 1
|
||
|
|
finally:
|
||
|
|
pass
|
||
|
|
|
||
|
|
def f():
|
||
|
|
g = gen()
|
||
|
|
next(g)
|
||
|
|
try:
|
||
|
|
try:
|
||
|
|
raise ValueError
|
||
|
|
except:
|
||
|
|
del g
|
||
|
|
raise KeyError
|
||
|
|
except Exception as e:
|
||
|
|
self.assertIsInstance(e.__context__, ValueError)
|
||
|
|
|
||
|
|
f()
|
||
|
|
|
||
|
|
def test_3611(self):
|
||
|
|
import gc
|
||
|
|
# A re-raised exception in a __del__ caused the __context__
|
||
|
|
# to be cleared
|
||
|
|
class C:
|
||
|
|
def __del__(self):
|
||
|
|
try:
|
||
|
|
1/0
|
||
|
|
except:
|
||
|
|
raise
|
||
|
|
|
||
|
|
def f():
|
||
|
|
x = C()
|
||
|
|
try:
|
||
|
|
try:
|
||
|
|
f.x
|
||
|
|
except AttributeError:
|
||
|
|
# make x.__del__ trigger
|
||
|
|
del x
|
||
|
|
gc.collect() # For PyPy or other GCs.
|
||
|
|
raise TypeError
|
||
|
|
except Exception as e:
|
||
|
|
self.assertNotEqual(e.__context__, None)
|
||
|
|
self.assertIsInstance(e.__context__, AttributeError)
|
||
|
|
|
||
|
|
with support.catch_unraisable_exception() as cm:
|
||
|
|
f()
|
||
|
|
|
||
|
|
self.assertEqual(ZeroDivisionError, cm.unraisable.exc_type)
|
||
|
|
|
||
|
|
|
||
|
|
class TestRemovedFunctionality(unittest.TestCase):
|
||
|
|
def test_tuples(self):
|
||
|
|
try:
|
||
|
|
raise (IndexError, KeyError) # This should be a tuple!
|
||
|
|
except TypeError:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
self.fail("No exception raised")
|
||
|
|
|
||
|
|
def test_strings(self):
|
||
|
|
try:
|
||
|
|
raise "foo"
|
||
|
|
except TypeError:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
self.fail("No exception raised")
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
unittest.main()
|