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import py.test
class AppTestRaise:
def test_arg_as_string(self):
def f():
raise "test"
raises(TypeError, f)
def test_control_flow(self):
try:
raise Exception
raise AssertionError("exception failed to raise")
except:
pass
else:
raise AssertionError("exception executing else clause!")
def test_store_exception(self):
try:
raise ValueError
except Exception as e:
assert e
def test_args(self):
try:
raise SystemError(1, 2)
except Exception as e:
assert e.args[0] == 1
assert e.args[1] == 2
def test_builtin_exc(self):
try:
[][0]
except IndexError as e:
assert isinstance(e, IndexError)
def test_raise_cls(self):
def f():
raise IndexError
raises(IndexError, f)
def test_raise_cls_catch(self):
def f(r):
try:
raise r
except LookupError:
return 1
raises(Exception, f, Exception)
assert f(IndexError) == 1
def test_raise_wrong(self):
try:
raise 1
except TypeError:
pass
else:
raise AssertionError("shouldn't be able to raise 1")
def test_revert_exc_info_1(self):
import sys
assert sys.exc_info() == (None, None, None)
try:
raise ValueError
except:
pass
assert sys.exc_info() == (None, None, None)
def test_revert_exc_info_2(self):
import sys
assert sys.exc_info() == (None, None, None)
try:
raise ValueError
except:
try:
raise IndexError
except:
assert sys.exc_info()[0] is IndexError
assert sys.exc_info()[0] is ValueError
assert sys.exc_info() == (None, None, None)
def test_revert_exc_info_2_finally(self):
import sys
assert sys.exc_info() == (None, None, None)
try:
try:
raise ValueError
finally:
try:
try:
raise IndexError
finally:
assert sys.exc_info()[0] is IndexError
except IndexError:
pass
assert sys.exc_info()[0] is ValueError
except ValueError:
pass
assert sys.exc_info() == (None, None, None)
def test_reraise_1(self):
raises(IndexError, """
import sys
try:
raise ValueError
except:
try:
raise IndexError
finally:
assert sys.exc_info()[0] is IndexError
raise
""")
def test_reraise_2(self):
raises(IndexError, """
def foo():
import sys
assert sys.exc_info()[0] is IndexError
raise
try:
raise ValueError
except:
try:
raise IndexError
finally:
foo()
""")
def test_reraise_3(self):
raises(IndexError, """
def spam():
import sys
try:
raise KeyError
except KeyError:
pass
assert sys.exc_info()[0] is IndexError
try:
raise ValueError
except:
try:
raise IndexError
finally:
spam()
""")
def test_reraise_4(self):
import sys
try:
raise ValueError
except:
try:
raise KeyError
except:
ok = sys.exc_info()[0] is KeyError
assert ok
def test_reraise_5(self):
raises(IndexError, """
import sys
try:
raise ValueError
except:
some_traceback = sys.exc_info()[2]
try:
raise KeyError
except:
try:
raise IndexError().with_traceback(some_traceback)
finally:
assert sys.exc_info()[0] is IndexError
assert sys.exc_info()[2].tb_next is some_traceback
""")
def test_nested_reraise(self):
raises(TypeError, """
def nested_reraise():
raise
try:
raise TypeError("foo")
except:
nested_reraise()
""")
def test_with_reraise_1(self):
class Context:
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, exc_tb):
return True
def fn():
try:
raise ValueError("foo")
except:
with Context():
pass
raise
raises(ValueError, "fn()")
def test_with_reraise_2(self):
class Context:
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, exc_tb):
return True
def fn():
try:
raise ValueError("foo")
except:
with Context():
raise KeyError("caught")
raise
raises(ValueError, "fn()")
def test_userclass(self):
# new-style classes can't be raised unless they inherit from
# BaseException
class A(object):
def __init__(self, x=None):
self.x = x
def f():
raise A
raises(TypeError, f)
def f():
raise A(42)
raises(TypeError, f)
def test_userclass_catch(self):
# classes can't be caught unless they inherit from BaseException
class A(object):
pass
for exc in A, (ZeroDivisionError, A):
try:
try:
1 / 0
except exc:
pass
except TypeError:
pass
else:
fail('Expected TypeError')
def test_it(self):
class C:
pass
# this used to explode in the exception normalization step:
try:
{}[C]
except KeyError:
pass
def test_catch_tuple(self):
class A(Exception):
pass
try:
raise ValueError
except (ValueError, A):
pass
else:
fail("Did not raise")
try:
raise A()
except (ValueError, A):
pass
else:
fail("Did not raise")
def test_obscure_bases(self):
"""
# this test checks bug-to-bug cpython compatibility
e = ValueError()
e.__bases__ = (5,)
try:
raise e
except ValueError:
pass
# explodes on CPython and py.test, not sure why
flag = False
class metaclass(type):
def __getattribute__(self, name):
if flag and name == '__bases__':
fail("someone read bases attr")
else:
return type.__getattribute__(self, name)
class A(BaseException, metaclass=metaclass):
pass
try:
a = A()
flag = True
raise a
except A:
pass
"""
def test_new_returns_bad_instance(self):
class MyException(Exception):
def __new__(cls, *args):
return object()
raises(TypeError, "raise MyException")
def test_with_exit_True(self):
class X:
def __enter__(self):
pass
def __exit__(self, *args):
return True
def g():
with X():
return 42
assert False, "unreachable"
assert g() == 42
def test_pop_exception_value(self):
# assert that this code don't crash
for i in range(10):
try:
raise ValueError
except ValueError as e:
continue
def test_clear_last_exception_on_break(self):
import sys
for i in [0]:
try:
raise ValueError
except ValueError:
break
assert sys.exc_info() == (None, None, None)
class AppTestRaiseContext:
def test_instance_context(self):
context = IndexError()
try:
try:
raise context
except:
raise OSError()
except OSError as e:
assert e.__context__ is context
else:
fail('No exception raised')
def test_class_context(self):
context = IndexError
try:
try:
raise context
except:
raise OSError()
except OSError as e:
assert e.__context__ != context
assert isinstance(e.__context__, context)
else:
fail('No exception raised')
def test_internal_exception(self):
try:
try:
1/0
except:
xyzzy
except NameError as e:
assert isinstance(e.__context__, ZeroDivisionError)
else:
fail("No exception raised")
def test_cycle_broken(self):
try:
try:
1/0
except ZeroDivisionError as e:
raise e
except ZeroDivisionError as e:
assert e.__context__ is None
else:
fail("No exception raised")
def test_reraise_cycle_broken(self):
try:
try:
xyzzy
except NameError as a:
try:
1/0
except ZeroDivisionError:
raise a
except NameError as e:
assert e.__context__.__context__ is None
else:
fail("No exception raised")
def test_context_once_removed(self):
context = IndexError()
def func1():
func2()
def func2():
try:
1/0
except ZeroDivisionError as e:
assert e.__context__ is context
else:
fail('No exception raised')
try:
raise context
except:
func1()
def test_frame_spanning_cycle_broken(self):
context = IndexError()
def func():
try:
1/0
except Exception as e1:
try:
raise context
except Exception as e2:
assert e2.__context__ is e1
assert e1.__context__ is None
else:
fail('No exception raised')
try:
raise context
except:
func()
def testCauseSyntax(self):
"""
try:
try:
try:
raise TypeError
except Exception:
raise ValueError from None
except ValueError as exc:
assert exc.__cause__ is None
assert exc.__suppress_context__ is True
assert isinstance(exc.__context__, TypeError)
exc.__suppress_context__ = False
raise exc
except ValueError as exc:
e = exc
assert e.__cause__ is None
assert e.__suppress_context__ is False
assert isinstance(e.__context__, TypeError)
"""
def test_context_in_builtin(self):
context = IndexError()
try:
try:
raise context
except:
compile('pass', 'foo', 'doh')
except ValueError as e:
assert e.__context__ is context
else:
fail('No exception raised')
def test_context_with_suppressed(self):
class RaiseExc:
def __init__(self, exc):
self.exc = exc
def __enter__(self):
return self
def __exit__(self, *exc_details):
raise self.exc
class SuppressExc:
def __enter__(self):
return self
def __exit__(self, *exc_details):
return True
try:
with RaiseExc(IndexError):
with SuppressExc():
with RaiseExc(ValueError):
1/0
except IndexError as exc:
assert exc.__context__ is None
else:
assert False, "should have raised"
def test_with_exception_context(self):
class Ctx:
def __enter__(self):
pass
def __exit__(self, *e):
1/0
try:
with Ctx():
raise ValueError
except ZeroDivisionError as e:
assert e.__context__ is not None
assert isinstance(e.__context__, ValueError)
else:
assert False, "should have raised"
class AppTestTraceback:
def test_raise_with___traceback__(self):
import sys
try:
raise ValueError
except:
exc_type,exc_val,exc_tb = sys.exc_info()
try:
exc_val.__traceback__ = exc_tb
raise exc_val
except:
exc_type2,exc_val2,exc_tb2 = sys.exc_info()
assert exc_type is exc_type2
assert exc_val is exc_val2
assert exc_tb is exc_tb2.tb_next
def test_sets_traceback(self):
import types
try:
raise IndexError()
except IndexError as e:
assert isinstance(e.__traceback__, types.TracebackType)
else:
fail("No exception raised")
def test_accepts_traceback(self):
import sys
def get_tb():
try:
raise OSError()
except:
return sys.exc_info()[2]
tb = get_tb()
try:
raise IndexError().with_traceback(tb)
except IndexError as e:
assert e.__traceback__ != tb
assert e.__traceback__.tb_next is tb
else:
fail("No exception raised")
def test_invalid_reraise(self):
try:
raise
except RuntimeError as e:
assert "No active exception" in str(e)
else:
fail("Expected RuntimeError")
def test_invalid_cause(self):
"""
try:
raise IndexError from 5
except TypeError as e:
assert "exception cause" in str(e)
else:
fail("Expected TypeError")
"""
def test_invalid_cause_setter(self):
"""
class Setter(BaseException):
def set_cause(self, cause):
self.cause = cause
__cause__ = property(fset=set_cause)
try:
raise Setter from 5
except TypeError as e:
assert "exception cause" in str(e)
else:
fail("Expected TypeError")
"""
|
