def _verify_method(self):
        """Verify that a method may be doubled.

        Verifies that the target object has a method matching the name the user is attempting to
        double.

        :raise: ``VerifyingDoubleError`` if no matching method is found.
        """

        class_level = self._target.is_class_or_module()

        verify_method(self._target, self._method_name, class_level=class_level)