pyunit-interest

[Pyunit-interest] Assert that an Exception is NOT raised.

[Timothy G. <tj...@cr...>]

I'm pretty new to PyUnit, one of the things I think is neat is that
there's a difference between test Failures and Errors. The problem is, I
want to assert that an Exception is NOT raised, but the test fails with
an Error because an Exception is raised.

Is there something like assertDoesNotRaise(ExceptionClass)?



--=20
Stand Fast,
    tjg.

Timothy Grant
www.craigelachie.org

Re: [Pyunit-interest] Assert that an Exception is NOT raised.

[Fred L. D. Jr. <fd...@ac...>]

Timothy Grant writes:
 > I'm pretty new to PyUnit, one of the things I think is neat is that
 > there's a difference between test Failures and Errors. The problem is, I
 > want to assert that an Exception is NOT raised, but the test fails with
 > an Error because an Exception is raised.
 > 
 > Is there something like assertDoesNotRaise(ExceptionClass)?

I'm afraid I've never found the distinction very useful in practice.
Whether something is reported as a failure or an error, I need to fix
a bug somewhere, and that's really the issue.


  -Fred

-- 
Fred L. Drake, Jr.  <fdrake at acm.org>
PythonLabs at Zope Corporation

Re: [Pyunit-interest] Assert that an Exception is NOT raised.

[Timothy G. <tj...@cr...>]

Dang,

I write my tests, then start writing code. I use the ratio of Error to
Failure to know how well I'm doing in my quest to get things right. I
mostly ignore the errors until I get the Failures taken care of then
move on to the next Failure.

In fact, I usually stub out methods and functions in my implementation
with a raise NotImplementedError before I actually go back and right my
code. That way I don't forget anything and I get a nice skeleton to hang
my code on.



On Tue, 2002-12-10 at 22:13, Fred L. Drake, Jr. wrote:
>=20
> Timothy Grant writes:
>  > I'm pretty new to PyUnit, one of the things I think is neat is that
>  > there's a difference between test Failures and Errors. The problem is,=
 I
>  > want to assert that an Exception is NOT raised, but the test fails wit=
h
>  > an Error because an Exception is raised.
>  >=20
>  > Is there something like assertDoesNotRaise(ExceptionClass)?
>=20
> I'm afraid I've never found the distinction very useful in practice.
> Whether something is reported as a failure or an error, I need to fix
> a bug somewhere, and that's really the issue.
>=20
>=20
>   -Fred
>=20
> --=20
> Fred L. Drake, Jr.  <fdrake at acm.org>
> PythonLabs at Zope Corporation
>=20
--=20
Stand Fast,
    tjg.

Timothy Grant
www.craigelachie.org

Re: [Pyunit-interest] Assert that an Exception is NOT raised.

[Noah S. <no...@no...>]

I'm not sure if I read your question right, but the follow code is
what I use to test for an exception NOT being raised.


class MissingExceptionTestCase (unittest.TestCase):
    def testMissingException (self):
        try:
            do_something_stupid_that_should_raise_an_exception ()
        except Exception:
            pass
        else:
            self.fail ('An Exception was expected, but it was not raised. This is bad.')


Yours,
Noah

----- Original Message ----- 
From: "Timothy Grant" <tj...@cr...>
To: <pyu...@li...>
Sent: Tuesday, December 10, 2002 10:07 PM
Subject: [Pyunit-interest] Assert that an Exception is NOT raised.

Re: [Pyunit-interest] Assert that an Exception is NOT raised.

[Timothy G. <tj...@cr...>]

Thanks Noah,

I think I might be able to make that work.  The situation is this, I'm
working on some code that while broken will raise an AttributeError
Exception. I want to make a FAILED test, right now I get an ERROR test.
Problem is, I only want to check for an AttributeError, cause other
Exceptions should cause and ERROR test not a FAILED test.


On Wed, 2002-12-11 at 06:47, Noah Spurrier wrote:
> I'm not sure if I read your question right, but the follow code is
> what I use to test for an exception NOT being raised.
>=20
>=20
> class MissingExceptionTestCase (unittest.TestCase):
>     def testMissingException (self):
>         try:
>             do_something_stupid_that_should_raise_an_exception ()
>         except Exception:
>             pass
>         else:
>             self.fail ('An Exception was expected, but it was not raised.=
 This is bad.')
>=20
>=20
> Yours,
> Noah
>=20
> ----- Original Message -----=20
> From: "Timothy Grant" <tj...@cr...>
> To: <pyu...@li...>
> Sent: Tuesday, December 10, 2002 10:07 PM
> Subject: [Pyunit-interest] Assert that an Exception is NOT raised.
>=20
>=20
>=20
--=20
Stand Fast,
    tjg.

Timothy Grant
www.craigelachie.org