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Overriding DateTime

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duffyd at kokorice

Mar 22, 2009, 10:21 PM

Post #1 of 11 (2519 views)
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Overriding DateTime

Hi,

I would like to override the DateTime.DateTime class within my
functional tests. I have tried mocking (via mocker) and injecting the
subclassed DateTime class into sys.modules (results in a
TraversalError). The fartherest I've gotten is to set DateTime.DateTime
= MySubclassedDateTime in my tests.py, which does work for the code
'within' the package(s) I'm testing but all the Zope core code (i.e. the
instance created within PloneTestCase) is still referencing the global
DateTime module. Has anyone successfully done this?

Thanks in advance,
Tim

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lists at zopyx

Mar 22, 2009, 10:25 PM

Post #2 of 11 (2437 views)
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Re: Overriding DateTime [In reply to]

On Mon, Mar 23, 2009 at 06:21, Tim Knapp <duffyd [at] kokorice> wrote:

> Hi,
>
> I would like to override the DateTime.DateTime class within my
> functional tests.

I have tried mocking (via mocker) and injecting the

> subclassed DateTime class into sys.modules (results in a
> TraversalError). The fartherest I've gotten is to set DateTime.DateTime
> = MySubclassedDateTime in my tests.py, which does work for the code
> 'within' the package(s) I'm testing but all the Zope core code (i.e. the
> instance created within PloneTestCase) is still referencing the global
> DateTime module. Has anyone successfully done this?

What is the particular usecase? Zope has a very strong dependency
from DateTime in various places. So there is almost no compatible way for
getting rid of it or for replacing it.
So why?

-aj

P.S. we don't like cross-postings - posting to one list is enough

duffyd at kokorice

Mar 23, 2009, 1:42 AM

Post #3 of 11 (2437 views)
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Re: Overriding DateTime [In reply to]

On Mon, 2009-03-23 at 06:25 +0100, Andreas Jung wrote:
>
>
> On Mon, Mar 23, 2009 at 06:21, Tim Knapp <duffyd [at] kokorice> wrote:
> Hi,
>
> I would like to override the DateTime.DateTime class within my
> functional tests.
> I have tried mocking (via mocker) and injecting the
>
> subclassed DateTime class into sys.modules (results in a
> TraversalError). The fartherest I've gotten is to set
> DateTime.DateTime
> = MySubclassedDateTime in my tests.py, which does work for the
> code
> 'within' the package(s) I'm testing but all the Zope core code
> (i.e. the
> instance created within PloneTestCase) is still referencing
> the global
> DateTime module. Has anyone successfully done this?
>
> What is the particular usecase?

I have applications that come into the system and fall into an invoicing
period based on the 'created' index. I've managed to override the
datetime in all my tests except in the 'created' index, which is
recording the 'actual' date time. One option is patching the 'created'
method in Archetypes/ExtensibleMetadata.py, which is what I'm favouring
at the moment.

> Zope has a very strong dependency
> from DateTime in various places. So there is almost no compatible way
> for getting rid of it or for replacing it.
> So why?

This is only in my tests as noted above.
>
> -aj

-Tim

> P.S. we don't like cross-postings - posting to one list is enough

Yeah, sorry about that. I am aware of this but wasn't entirely sure
which list was best given that DateTime is a Zope module but is used
heavily in Plone. I'll stick to the Zope list for questions of this
nature from now on :)

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chris at simplistix

Mar 23, 2009, 5:45 AM

Post #4 of 11 (2419 views)
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Re: Overriding DateTime [In reply to]

Tim Knapp wrote:
> I would like to override the DateTime.DateTime class within my
> functional tests. I have tried mocking (via mocker) and injecting the
> subclassed DateTime class into sys.modules (results in a
> TraversalError). The fartherest I've gotten is to set DateTime.DateTime
> = MySubclassedDateTime in my tests.py, which does work for the code
> 'within' the package(s) I'm testing but all the Zope core code (i.e. the
> instance created within PloneTestCase) is still referencing the global
> DateTime module. Has anyone successfully done this?

You should take a look at testfixtures ;-)

http://pypi.python.org/pypi/testfixtures

Specifically, the @replace decorator for one test or the Replacer (to
use in setUp and tearDown)

NB: Make sure you replace it in the module where's *used*, not the
module where it comes from...

cheers,

Chris

--
Simplistix - Content Management, Zope & Python Consulting
- http://www.simplistix.co.uk
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duffyd at kokorice

Mar 23, 2009, 1:35 PM

Post #5 of 11 (2422 views)
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Re: Overriding DateTime [In reply to]

Hi Chris,

On Mon, 2009-03-23 at 12:45 +0000, Chris Withers wrote:
> Tim Knapp wrote:
> > I would like to override the DateTime.DateTime class within my
> > functional tests. I have tried mocking (via mocker) and injecting the
> > subclassed DateTime class into sys.modules (results in a
> > TraversalError). The fartherest I've gotten is to set DateTime.DateTime
> > = MySubclassedDateTime in my tests.py, which does work for the code
> > 'within' the package(s) I'm testing but all the Zope core code (i.e. the
> > instance created within PloneTestCase) is still referencing the global
> > DateTime module. Has anyone successfully done this?
>
> You should take a look at testfixtures ;-)
>
> http://pypi.python.org/pypi/testfixtures
>
> Specifically, the @replace decorator for one test or the Replacer (to
> use in setUp and tearDown)
>
> NB: Make sure you replace it in the module where's *used*, not the
> module where it comes from...

Thanks. One thing, though, it appears that testfixtures requires python
2.5 as it tries to import functools that was introduced in python 2.5.

/me carries on trying to get it going :)

-Tim

>
> cheers,
>
> Chris
>

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dieter at handshake

Mar 25, 2009, 1:20 PM

Post #6 of 11 (2385 views)
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Re: Overriding DateTime [In reply to]

Tim Knapp wrote at 2009-3-23 18:21 +1300:
>I would like to override the DateTime.DateTime class within my
>functional tests. I have tried mocking (via mocker) and injecting the
>subclassed DateTime class into sys.modules (results in a
>TraversalError). The fartherest I've gotten is to set DateTime.DateTime
>= MySubclassedDateTime in my tests.py, which does work for the code
>'within' the package(s) I'm testing but all the Zope core code (i.e. the
>instance created within PloneTestCase) is still referencing the global
>DateTime module. Has anyone successfully done this?

"import DateTime; DateTime=<myDateTimeClass>" should be able
to replace the "DateTime" class -- sometimes.

Be aware, however, that this replacing takes effect only after
your assignment. Modules that already have imported the "DateTime"
class will not be affected.

--
Dieter
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duffyd at kokorice

Mar 25, 2009, 6:09 PM

Post #7 of 11 (2377 views)
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Re: Overriding DateTime [In reply to]

On Wed, 2009-03-25 at 21:20 +0100, Dieter Maurer wrote:
> Tim Knapp wrote at 2009-3-23 18:21 +1300:
> >I would like to override the DateTime.DateTime class within my
> >functional tests. I have tried mocking (via mocker) and injecting the
> >subclassed DateTime class into sys.modules (results in a
> >TraversalError). The fartherest I've gotten is to set DateTime.DateTime
> >= MySubclassedDateTime in my tests.py, which does work for the code
> >'within' the package(s) I'm testing but all the Zope core code (i.e. the
> >instance created within PloneTestCase) is still referencing the global
> >DateTime module. Has anyone successfully done this?
>
> "import DateTime; DateTime=<myDateTimeClass>" should be able
> to replace the "DateTime" class -- sometimes.
>
>
> Be aware, however, that this replacing takes effect only after
> your assignment. Modules that already have imported the "DateTime"
> class will not be affected.

Thanks, yeah that was what I thought. I tried to do it in the _setup
method of PloneTestCase, which theoretically gets called before the
instance is runup but maybe not. Didn't seem to affect the Zope instance
itself anyway.

-Tim

>
>

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m.van.rees at zestsoftware

Mar 26, 2009, 2:16 AM

Post #8 of 11 (2366 views)
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Re: Overriding DateTime [In reply to]

Tim Knapp, on 2009-03-26:
> On Wed, 2009-03-25 at 21:20 +0100, Dieter Maurer wrote:
>> Tim Knapp wrote at 2009-3-23 18:21 +1300:
>> >I would like to override the DateTime.DateTime class within my
>> >functional tests. I have tried mocking (via mocker) and injecting the
>> >subclassed DateTime class into sys.modules (results in a
>> >TraversalError). The fartherest I've gotten is to set DateTime.DateTime
>> >= MySubclassedDateTime in my tests.py, which does work for the code
>> >'within' the package(s) I'm testing but all the Zope core code (i.e. the
>> >instance created within PloneTestCase) is still referencing the global
>> >DateTime module. Has anyone successfully done this?
>>
>> "import DateTime; DateTime=<myDateTimeClass>" should be able
>> to replace the "DateTime" class -- sometimes.
>>
>>
>> Be aware, however, that this replacing takes effect only after
>> your assignment. Modules that already have imported the "DateTime"
>> class will not be affected.
>
> Thanks, yeah that was what I thought. I tried to do it in the _setup
> method of PloneTestCase, which theoretically gets called before the
> instance is runup but maybe not. Didn't seem to affect the Zope instance
> itself anyway.

A few years ago at Zest Software we needed a patch (for Archetypes I
think) and hit the same problem that our product was too late in the
startup process to have enough influence. So we put the patch in a
product called (Products.)AAAPatch; affectionately called triple A
patch. :-) Due to the three A-s at the beginning it was virtually
guaranteed to be the first product to load.

--
Maurits van Rees | http://maurits.vanrees.org/
Work | http://zestsoftware.nl/
"This is your day, don't let them take it away." [Barlow Girl]

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duffyd at kokorice

Mar 26, 2009, 2:25 AM

Post #9 of 11 (2358 views)
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Re: Overriding DateTime [In reply to]

On Thu, 2009-03-26 at 09:16 +0000, Maurits van Rees wrote:
> Tim Knapp, on 2009-03-26:
> > On Wed, 2009-03-25 at 21:20 +0100, Dieter Maurer wrote:
> >> Tim Knapp wrote at 2009-3-23 18:21 +1300:
> >> >I would like to override the DateTime.DateTime class within my
> >> >functional tests. I have tried mocking (via mocker) and injecting the
> >> >subclassed DateTime class into sys.modules (results in a
> >> >TraversalError). The fartherest I've gotten is to set DateTime.DateTime
> >> >= MySubclassedDateTime in my tests.py, which does work for the code
> >> >'within' the package(s) I'm testing but all the Zope core code (i.e. the
> >> >instance created within PloneTestCase) is still referencing the global
> >> >DateTime module. Has anyone successfully done this?
> >>
> >> "import DateTime; DateTime=<myDateTimeClass>" should be able
> >> to replace the "DateTime" class -- sometimes.
> >>
> >>
> >> Be aware, however, that this replacing takes effect only after
> >> your assignment. Modules that already have imported the "DateTime"
> >> class will not be affected.
> >
> > Thanks, yeah that was what I thought. I tried to do it in the _setup
> > method of PloneTestCase, which theoretically gets called before the
> > instance is runup but maybe not. Didn't seem to affect the Zope instance
> > itself anyway.
>
> A few years ago at Zest Software we needed a patch (for Archetypes I
> think) and hit the same problem that our product was too late in the
> startup process to have enough influence. So we put the patch in a
> product called (Products.)AAAPatch; affectionately called triple A
> patch. :-) Due to the three A-s at the beginning it was virtually
> guaranteed to be the first product to load.

Awesome, I'll give it a go and report back.

Thanks,
Tim

>

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chris at simplistix

Apr 2, 2009, 12:07 PM

Post #10 of 11 (2192 views)
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Re: Overriding DateTime [In reply to]

Tim Knapp wrote:
> Thanks. One thing, though, it appears that testfixtures requires python
> 2.5 as it tries to import functools that was introduced in python 2.5.
>
> /me carries on trying to get it going :)

Indeed, guess you'll have to go for Zope 2.12 :-)

Chris

--
Simplistix - Content Management, Zope & Python Consulting
- http://www.simplistix.co.uk
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chris at simplistix

Apr 2, 2009, 12:07 PM

Post #11 of 11 (2188 views)
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Re: Overriding DateTime [In reply to]

Dieter Maurer wrote:
> Be aware, however, that this replacing takes effect only after
> your assignment. Modules that already have imported the "DateTime"
> class will not be affected.

Yes, but you can replace them in the same way...

Just make sure you wrap in a try/finally so you un-replace no matter
what happens...

Chris

--
Simplistix - Content Management, Zope & Python Consulting
- http://www.simplistix.co.uk
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