from django.db import connection

from django.db.backends.base.introspection import BaseDatabaseIntrospection

from django.test import SimpleTestCase

class SimpleDatabaseIntrospectionTests(SimpleTestCase):

    may_require_msg = (

        "subclasses of BaseDatabaseIntrospection may require a %s() method"

    )

    def setUp(self):

        self.introspection = BaseDatabaseIntrospection(connection=connection)

    def test_get_table_list(self):

        msg = self.may_require_msg % "get_table_list"

        with self.assertRaisesMessage(NotImplementedError, msg):

            self.introspection.get_table_list(None)

    def test_get_table_description(self):

        msg = self.may_require_msg % "get_table_description"

        with self.assertRaisesMessage(NotImplementedError, msg):

            self.introspection.get_table_description(None, None)

    def test_get_sequences(self):

        msg = self.may_require_msg % "get_sequences"

        with self.assertRaisesMessage(NotImplementedError, msg):

            self.introspection.get_sequences(None, None)

    def test_get_relations(self):

        msg = self.may_require_msg % "get_relations"

        with self.assertRaisesMessage(NotImplementedError, msg):

            self.introspection.get_relations(None, None)

    def test_get_constraints(self):

        msg = self.may_require_msg % "get_constraints"

        with self.assertRaisesMessage(NotImplementedError, msg):

            self.introspection.get_constraints(None, None)