Django: Testing the 'clean' method of a custom ModelForm using Model-Mommy

Question

======= Update =======

@JF brought forward a brilliant perspective for the use of model mommy in ModelForms.

With the following code, I managed to automatically generate random data for all the fields of the model, except for the ones I would like to manipulate.

tests.py:

from django.test import TestCase
from houses.forms import ManForm
from houses.models import Man

class ModelsTest(TestCase):

    def test_Man(self):
        man = mommy.make('Man', age=20)
        data = {each_field.name: getattr(man, each_field.name) for each_field in man._meta.fields}
        data.update({'age_verification': 20})
        form = ManForm(data)
        self.assertTrue (form.is_valid())

---

models.py

from django.db import models

class Man(models.Model):
    name = models.CharField(max_length = 12)
    age = models.PositiveSmallIntegerField()

forms.py:

from my_app.models import Man
from django import forms
from django.core.exceptions import ValidationError

class ManForm(forms.ModelForm):
    age_verification = forms.IntegerField()

    def clean(self):
        if not self.cleaned_data['age'] == self.cleaned_data['age_verification']:
            raise ValidationError("Is this a LIE?")

    class Meta:
        model = Man
        fields = ['name', 'age', 'age_verification']    

For the time being, I test it like this:

tests.py:

from django.test import TestCase
from houses.forms import ManForm

class ModelsTest(TestCase):

    def test_Man(self):
        data = {
            'name' = 'John',
            'age' = 20,
            'ege_verification' = 20,
        }
        form = ManForm(data)

Is there a tool that provides random data for Forms? Or ... can I use the available tools for models for this purpose? Searching the docs of those supporting Python 3, I did not understand how this could be achieved.

The only one that clearly provides such a service is Django-Whatever which is not python3 compatible.

Answer 1

You could do something like this:

from model_mommy import mommy
class ModelsTest(TestCase):

    def test_Man(self):
        man = mommy.make('Man', _fill_optional=True)
        data = {
            'name': man.name,
            'age': man.age,
            'age_verification': man.age_verification,
        }
        form = ManForm(data)