Check django forms raised by ValidationError

Question

I am trying to validate my forms that raise validation error.

My test is as follows:

def test_register_password_strength(self): form_params = {'first_name': 'John', 'last_name': 'Doe', 'email': ' [e-mail] ', 'password': 'a', 'password_confirm': 'a', 'g-recaptcha-response': 'PASSED'} form = RegisterForm(form_params) self.assertFalse(form.is_valid()) try: form.clean_password() self.fail('Validation Error should be raised') except ValidationError as e: self.assertEquals('pw_too_short', e.code) 

And the form raises a ValidationError as follows:

  password = forms.CharField(label='Password', widget=forms.PasswordInput) widgets = { 'password': forms.PasswordInput(), } def clean_password(self): password = self.cleaned_data.get('password') if len(password) < 7: raise ValidationError('Password must be at least 7 characters long.', code='pw_too_short') return self.cleaned_data.get('password') 

self.assertFalse(form.is_valid()) correctly claims false, but when I try to call form.clean_password() , I get the following error: TypeError: object of type 'NoneType' has no len() .

self.cleaned_data does not have an element named password after calling form.is_valid() .

Is there any other way to test ValidationErrors besides calling is_valid() ?

Answer 1

Instead of using:

  try: form.clean_password() self.fail('Validation Error should be raised') except ValidationError as e: self.assertEquals('pw_too_short', e.code) 

Consider using Form.has_error('password', code='pw_too_short')

More information here: https://docs.djangoproject.com/en/1.8/ref/forms/api/#django.forms.Form.has_error