def METHOD_NAME(self):
    register = Registry()
    register("plugin1")(Plugin)
    plugin = register["plugin1"]
    request = factory.get("/xyz")
    step = FormStepFactory(
        form__slug="myform",
        form__authentication_backends=["plugin1"],
        form_definition__login_required=True,
    )
    form = step.form
    self.assertEqual(form.authentication_backends, ["plugin1"])
    options = register.get_options(request, form)
    self.assertEqual(len(options), 1)
    option = options[0]
    self.assertEqual(option.identifier, "plugin1")
    self.assertEqual(option.label, "some human readable label")
    self.assertEqual(option.url, plugin.get_start_url(request, form))