def test_link_or_page(self):
"""Test a validator: you can enter a url or a page_link, but not both."""
page_data = self.get_new_page_data()
response = self.client.post(URL_CMS_PAGE_ADD, page_data)
page = Page.objects.all()[0]
picture = Picture(url="test")
# Note: don't call full_clean as it will check ALL fields - including
# the image, which we haven't defined. Call clean() instead which
# just validates the url and page_link fields.
picture.clean()
picture.page_link = page
picture.url = None
picture.clean()
picture.url = "test"
self.assertRaises(ValidationError, picture.clean)
