Re: Testing file upload via a form?

[Derek]

Thanks Melvyn

Yes, over time I have come to learn the need for fat models and  Useful
Managers, plus having logic not embedded in the views (especially for
processing of data arising from a form).  So views are mostly "handlers" to
ensure that the forms are presented, the data is retrieved and passed on to
a processing method, and then the flow redirected to the right URL.

I have got hung up on the "mechanics" of form testing instead of seeing
that they only play a small role in the project.  I will however, persist
until I get the grammar correct.

Derek



On 3 September 2017 at 16:14, Melvyn Sopacua  wrote:

> It certainly isn't trivial.
>
> First and foremost, write fat models and Managers, but lean views.
>
> Rather then putting complex queries in views, I have a strong bias
> to writing manager methods (or QuerySet methods, if I feel it's
> reusable in more then one Manager - see Manager.from_queryset [1]).
>
> Further more, I tend to use the setup described here [2] also for
> projects. But for the `test_settings.py` I use:
>
> from project_app.settings import *
>
> INSTALLED_APPS += ['tests.apps.TestsConfig']
>
> This makes it trivial to test fields on their own, by creating models
> that only exist in the test environment.
>
> Normally, you want to test all components on their own, but with
> forms being so tightly coupled to and influenced by views and urls,
> it is non-trivial to predict what affects your form and thus test for it.
> It's easy to get 100% coverage on your form and still know nothing,
> because the input variations are important.
> Yes, it's possible to do with different initialization, but you're going
> to test your views anyway, so why not use the test client, as your
> views eventually determine what happens with them and are pretty
> much the only way to use them. On top of that, you're testing your
> urls for free.
>
> So in general, a Django test suite consists of:
> * model tests
> * view tests using django.test.Client
> * template tests [3]
> * command tests [4]
> * utility tests
>
> Hope this helps,
>
> [1] https://docs.djangoproject.com/en/1.11/topics/db/
> managers/#creating-a-manager-with-queryset-methods
> [2] https://docs.djangoproject.com/en/1.11/topics/testing/
> advanced/#testing-reusable-applications
> [3] shameless plug warning:
> http://django-xtc.readthedocs.io/en/latest/index.html
> [4] https://docs.djangoproject.com/en/1.11/ref/django-admin/#
> django.core.management.call_command
>
> On Sun, Sep 3, 2017 at 10:05 AM, Derek  wrote:
> > I have been looking for a decent guide that covers testing in a solid,
> > thorough way - there are lots of fragmented pieces that cover
> > bits-and-pieces of what is needed for tests but not all the cases with a
> > start-to-end comprehensive approach for everything ("Obey the Testing
> Goat"
> > comes closest). I need to cover cases for the admin as well - with
> actions
> > and intermediate forms, some with file uploads. In those case, I assume
> (?)
> > that the action logic is equivalent to a view.
> >
> > The Django docs show examples as well but I have not see where they cover
> > everything.
> >
> > This may all seem like trivial knowledge to people who have already done
> all
> > this, but I struggle to see the full picture of what a whole test suite
> > should look like, and what the details of all the tests would be.
> >
> >
> > On 3 September 2017 at 09:07, James Schneider 
> > wrote:
> >>
> >>
> >>
> >> On Sep 1, 2017 3:00 PM, "Derek"  wrote:
> >>
> >> Thanks Melvyn
> >>
> >> I already have tests for the processing of data when it has been
> uploaded
> >> - which is actually the critical issue for the application.  The "view"
> is
> >> just really a thin wrapper around the two steps : form display & upload
> and
> >> then the file processing itself : and those are the parts I need tests
> for.
> >>
> >>
> >> I'd have to agree with Melvin. You should be testing your view code as
> >> well, which would incorporate the tests for the form class. If the view
> is
> >> broken out interacts badly with the form for whatever reason, the fact
> that
> >> the form works on it's own is irrelevant. Plus it isn't that hard to
> add in.
> >>
> >> I would test the view even if it is boiler plate code shared by all of
> >> your forms, because you need to be certain that the combination of the
> view
> >> and form in question work together.
> >>
> >> -James
> >>
> >> --
> >> You received this message because you are subscribed to a topic in the
> >> Google Groups "Django users" group.
> >> To unsubscribe from this topic, visit
> >> https://groups.google.com/d/topic/django-users/GUStj-3rzD8/unsubscribe.
> >> To unsubscribe from this group and all its topics, send an email to
> >> django-users+unsubscr...@googlegroups.com.
> >> To post to this group, send email to django-users@googlegroups.com.
> >> Visit this group at 

Re: Testing file upload via a form?

[Melvyn Sopacua]

It certainly isn't trivial.

First and foremost, write fat models and Managers, but lean views.

Rather then putting complex queries in views, I have a strong bias
to writing manager methods (or QuerySet methods, if I feel it's
reusable in more then one Manager - see Manager.from_queryset [1]).

Further more, I tend to use the setup described here [2] also for
projects. But for the `test_settings.py` I use:

from project_app.settings import *

INSTALLED_APPS += ['tests.apps.TestsConfig']

This makes it trivial to test fields on their own, by creating models
that only exist in the test environment.

Normally, you want to test all components on their own, but with
forms being so tightly coupled to and influenced by views and urls,
it is non-trivial to predict what affects your form and thus test for it.
It's easy to get 100% coverage on your form and still know nothing,
because the input variations are important.
Yes, it's possible to do with different initialization, but you're going
to test your views anyway, so why not use the test client, as your
views eventually determine what happens with them and are pretty
much the only way to use them. On top of that, you're testing your
urls for free.

So in general, a Django test suite consists of:
* model tests
* view tests using django.test.Client
* template tests [3]
* command tests [4]
* utility tests

Hope this helps,

[1] 
https://docs.djangoproject.com/en/1.11/topics/db/managers/#creating-a-manager-with-queryset-methods
[2] 
https://docs.djangoproject.com/en/1.11/topics/testing/advanced/#testing-reusable-applications
[3] shameless plug warning:
http://django-xtc.readthedocs.io/en/latest/index.html
[4] 
https://docs.djangoproject.com/en/1.11/ref/django-admin/#django.core.management.call_command

On Sun, Sep 3, 2017 at 10:05 AM, Derek  wrote:
> I have been looking for a decent guide that covers testing in a solid,
> thorough way - there are lots of fragmented pieces that cover
> bits-and-pieces of what is needed for tests but not all the cases with a
> start-to-end comprehensive approach for everything ("Obey the Testing Goat"
> comes closest). I need to cover cases for the admin as well - with actions
> and intermediate forms, some with file uploads. In those case, I assume (?)
> that the action logic is equivalent to a view.
>
> The Django docs show examples as well but I have not see where they cover
> everything.
>
> This may all seem like trivial knowledge to people who have already done all
> this, but I struggle to see the full picture of what a whole test suite
> should look like, and what the details of all the tests would be.
>
>
> On 3 September 2017 at 09:07, James Schneider 
> wrote:
>>
>>
>>
>> On Sep 1, 2017 3:00 PM, "Derek"  wrote:
>>
>> Thanks Melvyn
>>
>> I already have tests for the processing of data when it has been uploaded
>> - which is actually the critical issue for the application.  The "view" is
>> just really a thin wrapper around the two steps : form display & upload and
>> then the file processing itself : and those are the parts I need tests for.
>>
>>
>> I'd have to agree with Melvin. You should be testing your view code as
>> well, which would incorporate the tests for the form class. If the view is
>> broken out interacts badly with the form for whatever reason, the fact that
>> the form works on it's own is irrelevant. Plus it isn't that hard to add in.
>>
>> I would test the view even if it is boiler plate code shared by all of
>> your forms, because you need to be certain that the combination of the view
>> and form in question work together.
>>
>> -James
>>
>> --
>> You received this message because you are subscribed to a topic in the
>> Google Groups "Django users" group.
>> To unsubscribe from this topic, visit
>> https://groups.google.com/d/topic/django-users/GUStj-3rzD8/unsubscribe.
>> To unsubscribe from this group and all its topics, send an email to
>> django-users+unsubscr...@googlegroups.com.
>> To post to this group, send email to django-users@googlegroups.com.
>> Visit this group at https://groups.google.com/group/django-users.
>> To view this discussion on the web visit
>> https://groups.google.com/d/msgid/django-users/CA%2Be%2BciUgbWkGFVrqBWKAYdifP%2BjTchZwHR0-GfPKGcTjP%3DBjfA%40mail.gmail.com.
>>
>> For more options, visit https://groups.google.com/d/optout.
>
>
> --
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>
> For more options, visit 

Re: Testing file upload via a form?

[Derek]

I have been looking for a decent guide that covers testing in a solid,
thorough way - there are lots of fragmented pieces that cover
bits-and-pieces of what is needed for tests but not all the cases with a
start-to-end comprehensive approach for everything ("Obey the Testing Goat"
comes closest). I need to cover cases for the admin as well - with actions
and intermediate forms, some with file uploads. In those case, I assume (?)
that the action logic is equivalent to a view.

The Django docs show examples as well but I have not see where they cover
everything.

This may all seem like trivial knowledge to people who have already done
all this, but I struggle to see the full picture of what a whole test suite
should look like, and what the details of all the tests would be.


On 3 September 2017 at 09:07, James Schneider 
wrote:

>
>
> On Sep 1, 2017 3:00 PM, "Derek"  wrote:
>
> Thanks Melvyn
>
> I already have tests for the processing of data when it has been uploaded
> - which is actually the critical issue for the application.  The "view" is
> just really a thin wrapper around the two steps : form display & upload and
> then the file processing itself : and those are the parts I need tests for.
>
>
> I'd have to agree with Melvin. You should be testing your view code as
> well, which would incorporate the tests for the form class. If the view is
> broken out interacts badly with the form for whatever reason, the fact that
> the form works on it's own is irrelevant. Plus it isn't that hard to add
> in.
>
> I would test the view even if it is boiler plate code shared by all of
> your forms, because you need to be certain that the combination of the view
> and form in question work together.
>
> -James
>
> --
> You received this message because you are subscribed to a topic in the
> Google Groups "Django users" group.
> To unsubscribe from this topic, visit https://groups.google.com/d/
> topic/django-users/GUStj-3rzD8/unsubscribe.
> To unsubscribe from this group and all its topics, send an email to
> django-users+unsubscr...@googlegroups.com.
> To post to this group, send email to django-users@googlegroups.com.
> Visit this group at https://groups.google.com/group/django-users.
> To view this discussion on the web visit https://groups.google.com/d/
> msgid/django-users/CA%2Be%2BciUgbWkGFVrqBWKAYdifP%
> 2BjTchZwHR0-GfPKGcTjP%3DBjfA%40mail.gmail.com
> 
> .
>
> For more options, visit https://groups.google.com/d/optout.
>

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For more options, visit https://groups.google.com/d/optout.

Re: Testing file upload via a form?

[James Schneider]

On Sep 1, 2017 3:00 PM, "Derek"  wrote:

Thanks Melvyn

I already have tests for the processing of data when it has been uploaded -
which is actually the critical issue for the application.  The "view" is
just really a thin wrapper around the two steps : form display & upload and
then the file processing itself : and those are the parts I need tests for.


I'd have to agree with Melvin. You should be testing your view code as
well, which would incorporate the tests for the form class. If the view is
broken out interacts badly with the form for whatever reason, the fact that
the form works on it's own is irrelevant. Plus it isn't that hard to add
in.

I would test the view even if it is boiler plate code shared by all of your
forms, because you need to be certain that the combination of the view and
form in question work together.

-James

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Re: Testing file upload via a form?

[Derek]

Thanks Melvyn

I already have tests for the processing of data when it has been uploaded -
which is actually the critical issue for the application.  The "view" is
just really a thin wrapper around the two steps : form display & upload and
then the file processing itself : and those are the parts I need tests for.


On 1 September 2017 at 17:12, Melvyn Sopacua  wrote:

> You're not using the test **Client** at all. You're testing the value
> of a form.Form instance.
>
> The difference is that the test client constructs an actual request,
> using the known URLs. So you'd need a view and url as well.
> But these can exist only in the test and to be honest, especially
> with uploads, I'm more interested in the upload working when used
> in a view, then whether the form works in an environment it's never
> going to be used in.
>
> That said, James is right on the money with the payload. It doesn't
> however tell you file uploads are going to work, only that a correctly
> bound file passes validation.
>
>
> On Fri, Sep 1, 2017 at 9:07 AM, Derek  wrote:
> > Thanks Melvyn
> >
> > I thought my code did follow that approach - but it does not seem to
> work.
> > So either I have not understood the docs (in which case, a point to the
> > specific item is what I need) or there is some other factor at work.
> >
> > On 31 August 2017 at 16:47, Melvyn Sopacua 
> wrote:
> >>
> >> In the documentation of the test client it is all spelled out how to
> test
> >> file uploads.
> >>
> >> On Tue, Aug 29, 2017 at 8:48 PM, Derek  wrote:
> >>>
> >>> (Python 3.5 and Django 1.10)
> >>>
> >>> I am trying to test a Django form that enables a required file upload.
> >>>
> >>> The form is very simple and includes a field that looks like:
> >>>
> >>> upload_file = forms.FileField()
> >>>
> >>> The corresponding test to try and check the upload:
> >>>
> >>> def test_form_validation_with_file(self):
> >>> fake_file = ContentFile(b'''Some file content''')
> >>> fake_file.name = 'fake.xls'
> >>> suf_file = SimpleUploadedFile('suf.xls', b'''this is text''')
> >>> data = {
> >>> 'upload_file': suf_file,
> >>> }
> >>> form = forms.RequestForm(data=data)
> >>> self.assertTrue(form.is_valid())
> >>>
> >>> The form validation fails i.e. it does not seem to recognise that file
> >>> data has been suppplied.
> >>>
> >>> I have also tried with the  "fake_file" for the data but without
> success.
> >>>
> >>> Any help or pointers appreciated.
> >>>
> >>> Thanks
> >>> Derek
> >>>
> >>> --
> >>> You received this message because you are subscribed to the Google
> Groups
> >>> "Django users" group.
> >>> To unsubscribe from this group and stop receiving emails from it, send
> an
> >>> email to django-users+unsubscr...@googlegroups.com.
> >>> To post to this group, send email to django-users@googlegroups.com.
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> >>> https://groups.google.com/d/msgid/django-users/
> CAF1Wu3OTCbnw4o749YUz-Pa1-Uo9jkGkd1KybB5rSLnp3eAMDQ%40mail.gmail.com.
> >>> For more options, visit https://groups.google.com/d/optout.
> >>
> >>
> >>
> >>
> >> --
> >> Melvyn Sopacua
> >>
> >> --
> >> You received this message because you are subscribed to a topic in the
> >> Google Groups "Django users" group.
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> >> https://groups.google.com/d/msgid/django-users/CA%
> 2Bgw1GVt-pwLwdTx_0m2nj-uy0A%3DBQh8L1aeFNnraMCAy%3DP-iw%40mail.gmail.com.
> >> For more options, visit https://groups.google.com/d/optout.
> >
> >
> > --
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> > For more options, visit https://groups.google.com/d/optout.
>
>
>
> --
> Melvyn Sopacua
>
> --
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Re: Testing file upload via a form?

[Melvyn Sopacua]

You're not using the test **Client** at all. You're testing the value
of a form.Form instance.

The difference is that the test client constructs an actual request,
using the known URLs. So you'd need a view and url as well.
But these can exist only in the test and to be honest, especially
with uploads, I'm more interested in the upload working when used
in a view, then whether the form works in an environment it's never
going to be used in.

That said, James is right on the money with the payload. It doesn't
however tell you file uploads are going to work, only that a correctly
bound file passes validation.


On Fri, Sep 1, 2017 at 9:07 AM, Derek  wrote:
> Thanks Melvyn
>
> I thought my code did follow that approach - but it does not seem to work.
> So either I have not understood the docs (in which case, a point to the
> specific item is what I need) or there is some other factor at work.
>
> On 31 August 2017 at 16:47, Melvyn Sopacua  wrote:
>>
>> In the documentation of the test client it is all spelled out how to test
>> file uploads.
>>
>> On Tue, Aug 29, 2017 at 8:48 PM, Derek  wrote:
>>>
>>> (Python 3.5 and Django 1.10)
>>>
>>> I am trying to test a Django form that enables a required file upload.
>>>
>>> The form is very simple and includes a field that looks like:
>>>
>>> upload_file = forms.FileField()
>>>
>>> The corresponding test to try and check the upload:
>>>
>>> def test_form_validation_with_file(self):
>>> fake_file = ContentFile(b'''Some file content''')
>>> fake_file.name = 'fake.xls'
>>> suf_file = SimpleUploadedFile('suf.xls', b'''this is text''')
>>> data = {
>>> 'upload_file': suf_file,
>>> }
>>> form = forms.RequestForm(data=data)
>>> self.assertTrue(form.is_valid())
>>>
>>> The form validation fails i.e. it does not seem to recognise that file
>>> data has been suppplied.
>>>
>>> I have also tried with the  "fake_file" for the data but without success.
>>>
>>> Any help or pointers appreciated.
>>>
>>> Thanks
>>> Derek
>>>
>>> --
>>> You received this message because you are subscribed to the Google Groups
>>> "Django users" group.
>>> To unsubscribe from this group and stop receiving emails from it, send an
>>> email to django-users+unsubscr...@googlegroups.com.
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>>> To view this discussion on the web visit
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>>> For more options, visit https://groups.google.com/d/optout.
>>
>>
>>
>>
>> --
>> Melvyn Sopacua
>>
>> --
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>> For more options, visit https://groups.google.com/d/optout.
>
>
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-- 
Melvyn Sopacua

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Re: Testing file upload via a form?

[Derek]

Thanks James, I will try that.

On 1 September 2017 at 09:27, James Schneider 
wrote:

>
>
> On Aug 29, 2017 11:49 AM, "Derek"  wrote:
>
> (Python 3.5 and Django 1.10)
>
> I am trying to test a Django form that enables a required file upload.
>
> The form is very simple and includes a field that looks like:
>
> upload_file = forms.FileField()
>
> The corresponding test to try and check the upload:
>
> def test_form_validation_with_file(self):
> fake_file = ContentFile(b'''Some file content''')
> fake_file.name = 'fake.xls'
> suf_file = SimpleUploadedFile('suf.xls', b'''this is text''')
> data = {
> 'upload_file': suf_file,
> }
> form = forms.RequestForm(data=data)
> self.assertTrue(form.is_valid())
>
> The form validation fails i.e. it does not seem to recognise that file
> data has been suppplied.
>
> I have also tried with the  "fake_file" for the data but without success.
>
> Any help or pointers appreciated.
>
>
> It does not appear that you are binding the file to the form correctly.
> Django forms use a separate argument to the form class for file content. It
> is not part of the form 'data'.
>
> https://docs.djangoproject.com/en/1.11/ref/forms/api/#
> binding-uploaded-files-to-a-form
>
> -James
>
> --
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Re: Testing file upload via a form?

[James Schneider]

On Aug 29, 2017 11:49 AM, "Derek"  wrote:

(Python 3.5 and Django 1.10)

I am trying to test a Django form that enables a required file upload.

The form is very simple and includes a field that looks like:

upload_file = forms.FileField()

The corresponding test to try and check the upload:

def test_form_validation_with_file(self):
fake_file = ContentFile(b'''Some file content''')
fake_file.name = 'fake.xls'
suf_file = SimpleUploadedFile('suf.xls', b'''this is text''')
data = {
'upload_file': suf_file,
}
form = forms.RequestForm(data=data)
self.assertTrue(form.is_valid())

The form validation fails i.e. it does not seem to recognise that file data
has been suppplied.

I have also tried with the  "fake_file" for the data but without success.

Any help or pointers appreciated.


It does not appear that you are binding the file to the form correctly.
Django forms use a separate argument to the form class for file content. It
is not part of the form 'data'.

https://docs.djangoproject.com/en/1.11/ref/forms/api/#binding-uploaded-files-to-a-form

-James

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Re: Testing file upload via a form?

[Derek]

Thanks Melvyn

I thought my code did follow that approach - but it does not seem to work.
So either I have not understood the docs (in which case, a point to the
specific item is what I need) or there is some other factor at work.

On 31 August 2017 at 16:47, Melvyn Sopacua  wrote:

> ​In the documentation of the test client
> 
>  it
> is all spelled out how to test file uploads.
> ​
> ​
>
> On Tue, Aug 29, 2017 at 8:48 PM, Derek  wrote:
>
>> (Python 3.5 and Django 1.10)
>>
>> I am trying to test a Django form that enables a required file upload.
>>
>> The form is very simple and includes a field that looks like:
>>
>> upload_file = forms.FileField()
>>
>> The corresponding test to try and check the upload:
>>
>> def test_form_validation_with_file(self):
>> fake_file = ContentFile(b'''Some file content''')
>> fake_file.name = 'fake.xls'
>> suf_file = SimpleUploadedFile('suf.xls', b'''this is text''')
>> data = {
>> 'upload_file': suf_file,
>> }
>> form = forms.RequestForm(data=data)
>> self.assertTrue(form.is_valid())
>>
>> The form validation fails i.e. it does not seem to recognise that file
>> data has been suppplied.
>>
>> I have also tried with the  "fake_file" for the data but without success.
>>
>> Any help or pointers appreciated.
>>
>> Thanks
>> Derek
>>
>> --
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>> "Django users" group.
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>> email to django-users+unsubscr...@googlegroups.com.
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>> np3eAMDQ%40mail.gmail.com
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>> .
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>>
>
>
>
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Re: Testing file upload via a form?

[Melvyn Sopacua]

​In the documentation of the test client

it
is all spelled out how to test file uploads.
​
​

On Tue, Aug 29, 2017 at 8:48 PM, Derek  wrote:

> (Python 3.5 and Django 1.10)
>
> I am trying to test a Django form that enables a required file upload.
>
> The form is very simple and includes a field that looks like:
>
> upload_file = forms.FileField()
>
> The corresponding test to try and check the upload:
>
> def test_form_validation_with_file(self):
> fake_file = ContentFile(b'''Some file content''')
> fake_file.name = 'fake.xls'
> suf_file = SimpleUploadedFile('suf.xls', b'''this is text''')
> data = {
> 'upload_file': suf_file,
> }
> form = forms.RequestForm(data=data)
> self.assertTrue(form.is_valid())
>
> The form validation fails i.e. it does not seem to recognise that file
> data has been suppplied.
>
> I have also tried with the  "fake_file" for the data but without success.
>
> Any help or pointers appreciated.
>
> Thanks
> Derek
>
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