from django.db import models

from django.db.backends.base.schema import BaseDatabaseSchemaEditor

from django.test import SimpleTestCase

class SchemaEditorTests(SimpleTestCase):

    def test_effective_default_callable(self):

        """SchemaEditor.effective_default() shouldn't call callable defaults."""

        class MyStr(str):

            def __call__(self):

                return self

        class MyCharField(models.CharField):

            def _get_default(self):

                return self.default

        field = MyCharField(max_length=1, default=MyStr)

        self.assertEqual(BaseDatabaseSchemaEditor._effective_default(field), MyStr)