from django.forms import FileInput from .base import WidgetTest class FileInputTest(WidgetTest): widget = FileInput() def test_render(self): """ FileInput widgets never render the value attribute. The old value isn't useful if a form is updated or an error occurred. """ self.check_html( self.widget, "email", "test@example.com", html='', ) self.check_html( self.widget, "email", "", html='' ) self.check_html( self.widget, "email", None, html='' ) def test_value_omitted_from_data(self): self.assertIs(self.widget.value_omitted_from_data({}, {}, "field"), True) self.assertIs( self.widget.value_omitted_from_data({}, {"field": "value"}, "field"), False ) def test_use_required_attribute(self): # False when initial data exists. The file input is left blank by the # user to keep the existing, initial value. self.assertIs(self.widget.use_required_attribute(None), True) self.assertIs(self.widget.use_required_attribute("resume.txt"), False)