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_sequences(self):
        msg = self.may_require_msg % 'get_sequences'
        with self.assertRaisesMessage(NotImplementedError, msg):
            self.introspection.get_sequences(None, None)

    def test_get_key_columns(self):
        msg = self.may_require_msg % 'get_key_columns'
        with self.assertRaisesMessage(NotImplementedError, msg):
            self.introspection.get_key_columns(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)