human
Solve the following python programming problem given the following code:
def test__getting_default_database_valid(self) : 
    def gddb(uri) : 
        client = mongomock.MongoClient (uri) 
        return (client, client.get_default_database ()) 
(c, db) = gddb ('mongodb://host1/foo') 
    self.assertIsNotNone (db) 
    self.assertIsInstance (db, Database) 
    self.assertIs (db.client, c) 
    self.assertIs (db, c ['foo']) 
    (c, db) = gddb ('mongodb://host1/bar') 
    self.assertIs (db, c ['bar']) 
    (c, db) = gddb ('mongodb://a%00lice:f%00oo@127.0.0.1/t%00est') 
    self.assertIs (db, c ['t\x00est']) 
    (c, db) = gddb ('mongodb://bob:bar@[::1]:27018/admin') 
    self.assertIs (c, c ['admin']) 
    (c, db) = gddb ('mongodb://%24am:f%3Azzb%40zz@127.0.0.1/admin%3F?authMechanism=MONGODB-CR') 
    self.assertIs (db, c ['admin?']) 

    
    

    Fix the buggy line: self.assertIs (c, c ['admin'])
assistant
#Here is Python code to fix the buggy line: self.

self.assertIs (db, c ['admin'])