Fixed #14415 -- Used the test database name in BaseDatabaseCreation.test_db_signature().

            settings_dict['HOST'],

            settings_dict['PORT'],

            settings_dict['ENGINE'],

            settings_dict['NAME']

            self._get_test_db_name(),

        )

import copy

from django.db import DEFAULT_DB_ALIAS, connections

from django.db.backends.base.creation import (

    TEST_DATABASE_PREFIX, BaseDatabaseCreation,

)

from django.test import SimpleTestCase

class TestDbSignatureTests(SimpleTestCase):

    def get_connection_copy(self):

        # Get a copy of the default connection. (Can't use django.db.connection

        # because it'll modify the default connection itself.)

        test_connection = copy.copy(connections[DEFAULT_DB_ALIAS])

        test_connection.settings_dict = copy.copy(connections[DEFAULT_DB_ALIAS].settings_dict)

        return test_connection

    def test_default_name(self):

        # A test db name isn't set.

        prod_name = 'hodor'

        test_connection = self.get_connection_copy()

        test_connection.settings_dict['NAME'] = prod_name

        test_connection.settings_dict['TEST'] = {'NAME': None}

        signature = BaseDatabaseCreation(test_connection).test_db_signature()

        self.assertEqual(signature[3], TEST_DATABASE_PREFIX + prod_name)

    def test_custom_test_name(self):

        # A regular test db name is set.

        test_name = 'hodor'

        test_connection = self.get_connection_copy()

        test_connection.settings_dict['TEST'] = {'NAME': test_name}

        signature = BaseDatabaseCreation(test_connection).test_db_signature()

        self.assertEqual(signature[3], test_name)

    def test_custom_test_name_with_test_prefix(self):

        # A test db name prefixed with TEST_DATABASE_PREFIX is set.

        test_name = TEST_DATABASE_PREFIX + 'hodor'

        test_connection = self.get_connection_copy()

        test_connection.settings_dict['TEST'] = {'NAME': test_name}

        signature = BaseDatabaseCreation(test_connection).test_db_signature()

        self.assertEqual(signature[3], test_name)