/tests/regressiontests/admin_views/forms.py

 1from django import forms
 2from django.contrib.admin.forms import AdminAuthenticationForm
 3
 4class CustomAdminAuthenticationForm(AdminAuthenticationForm):
 5
 6    def clean_username(self):
 7        username = self.cleaned_data.get('username')
 8        if username == 'customform':
 9            raise forms.ValidationError('custom form error')
10        return username