# Unit tests for Antichecked Exceptions for Python
# Copyright (c) 2021 Soni L.
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from antichecked import exceptions
class expect:
def __init__(self, exc, *, cause, context):
self.exc = exc
self.cause = cause or type(None)
self.context = context or type(None)
def __enter__(self):
pass
def __exit__(self, exc_ty, exc_val, exc_tb):
assert exc_ty is self.exc
assert type(exc_val.__cause__) is self.cause
assert type(exc_val.__context__) is self.context
return True
def foo(i):
with exceptions(ValueError) as r:
try:
x = int(i)
except ValueError:
# re-raise ValueError from int()
raise r
else:
if x < 0:
# attempt to raise r without a context
# (should turn into RuntimeError, just like bare raise)
raise r
# this raises ValueError if x is not 1, and it becomes wrapped in
# RuntimeError
x, = [x]*x
def test_foo():
# ValueError from int() passes through (re-raised), context/cause is None
with expect(ValueError, cause=None, context=None):
foo("false")
# ValueError from unpacking gets wrapped, cause and context are ValueError
with expect(RuntimeError, cause=ValueError, context=ValueError):
foo("10")
# raise r without context becomes RuntimeError
with expect(RuntimeError, cause=None, context=None):
foo("-10")
# "1" gets accepted and doesn't raise anything
foo("1")
def bar():
with exceptions(ValueError) as r:
raise r
def test_bar():
with expect(RuntimeError, cause=None, context=None):
bar()
def fake_gen():
with exceptions(StopIteration) as r:
next(iter([]))
def test_fake_gen():
# actual generators don't use RuntimeError but we have no way of testing that
with expect(RuntimeError, cause=StopIteration, context=StopIteration):
fake_gen()
def baz(i):
with exceptions(ValueError) as r:
try:
x = int(i)
except ValueError:
# raise new exception with context
raise r(TypeError)
else:
if x < 0:
# raise a new ValueError
raise r(ValueError)
try:
x, = [x]*x
except ValueError as e:
# raise with cause
raise r(TypeError) from e
def test_baz():
# ValueError from int() becomes TypeError with context
with expect(TypeError, cause=None, context=ValueError):
baz("false")
# raise TypeError with cause and context being ValueError
with expect(TypeError, cause=ValueError, context=ValueError):
baz("10")
# raise ValueError through antichecked exceptions
with expect(ValueError, cause=None, context=None):
baz("-10")
# "1" gets accepted and doesn't raise anything
baz("1")
def test_all():
test_foo()
test_bar()
test_fake_gen()
test_baz()
if __name__ == "__main__":
test_all()
