def test_NoneField_validates_None_value(self):
field = NoneField()
field.validate(None)
def test_NoneField_raises_ValidationError_on_incorrect_types(self):
field = NoneField()
self.assertRaises(ValidationError, field.validate, {})
self.assertRaises(ValidationError, field.validate, u'')
def test_NoneField_json_methods(self):
f = NoneField()
self.assertEquals(None, f.from_json(f.to_json(None)))
self.assertEquals(None, f.to_json(f.from_json(None)))