katiayn

class Property(models.Model):
    # fields

    class Meta:
        abstract = True

katiayn

class Property(models.Model):
    price = models.DecimalField(max_digits=15, decimal_places=2)
    rooms = models.PositiveIntegerField()
    address = models.TextField(null=True, blank=True)
    city = models.CharField(max_length=255)
    country = models.CharField(max_length=255)

    class Meta:
        abstract = True

katiayn

$ # mut.py --target node --unit-test test_node
$ mut.py --target calculator --unit-test test_calculator -m

katiayn

[*] Start mutation process:
   - targets: calculator
   - tests: test_calculator
[*] All tests passed:
   - test_calculator [0.00031 s]
[*] Start mutants generation and execution:
   - [#   1] AOR calculator.py:2  :
--------------------------------------------------------------------
 1: def mul(x, y):
~2:     return x / y

katiayn

class ProductQuestionnaireCreateTestCase(SimpleTestCase):

    def test_vat_20_if_biscuit_coated_in_chocolate(self):
        calc = VATCalculator()
        self.assertEqual(
            calc.calculate_vat(
                is_biscuit=True,
                is_coated_in_chocolate=True
            ), 20)

katiayn

class VATCalculator(object):

    def calculate_vat(self, **kwargs):
        is_biscuit = kwargs['is_biscuit']
        is_coated_in_chocolate = kwargs['is_coated_in_chocolate']
        if is_biscuit and is_coated_in_chocolate:
            return 20

katiayn

class ProductQuestionnaireTestCase(TestCase):

    def test_vat_20_if_biscuit_coated_in_chocolate(self):
        product = ProductFactory()
        form = ProductQuestionnaireForm(data={
            'is_biscuit': True,
            'is_coated_in_chocolate': True
        })
        self.assertTrue(form.is_valid())
        form.save()

katiayn

class ProductQuestionnaireForm(forms.ModelForm):

    class Meta:
        model = ProductQuestionnaire
        exclude = (
            'id',
            'product',
        )

    def save(self, commit=True):

katiayn

class ProductQuestionnaireTestCase(TestCase):

    def test_vat_20_if_biscuit_coated_in_chocolate(self):
        product = ProductFactory()
        url = '/{}/questionnaire/'.format(product.pk)
        self.client.post(url, {
            'is_biscuit': True,
            'is_coated_in_chocolate': True
        })
        product.refresh_from_db()

katiayn

def form_valid(self, form):
    self.instance = form.save(commit=False)
    object = self.get_object()
    if self.instance.is_biscuit and self.instance.is_coated_in_chocolate:
        object.set_vat_20()
    return super().form_valid(form)