human
Solve the following python programming problem given the following code:
def _test_models_not_sync_filtered(self) : 
    self.metadata_migrations.clear () 
    sa.Table ('table', self.metadata_migrations, sa.Column ('fk_check', sa.String (36), nullable = False), sa.PrimaryKeyConstraint ('fk_check'), mysql_engine = 'InnoDB') 
    sa.Table ('testtbl', self.metadata_migrations, sa.Column ('id', sa.Integer, primary_key = True), sa.Column ('spam', sa.String (8), nullable = True), sa.Column ('eggs', sa.DateTime), sa.Column ('foo', sa.Boolean, server_default = sa.sql.expression.false ()), sa.Column ('bool_wo_default', sa.Boolean, unique = True), sa.Column ('bar', sa.BigInteger), sa.Column ('defaulttest', sa.Integer, server_default = '7'), sa.Column ('defaulttest2', sa.String (8), server_default = ''), sa.Column ('defaulttest3', sa.String (5), server_default = 'fake'), sa.Column ('defaulttest4', sa.Enum ('first', 'second', name = 'testenum'), server_default = 'first'), sa.Column ('fk_check', sa.String (36), nullable = False), sa.UniqueConstraint ('spam', 'foo', name = 'uniq_cons'), sa.ForeignKeyConstraint (['fk_check'], ['table.fk_check']), mysql_engine = 'InnoDB') 
    with mock.patch.object (self, 'filter_metadata_diff') as filter_mock : 
        def filter_diffs(diffs) : 
            return [diff for diff in diffs if ('constraint' in diff [0])] 
filter_mock.side_effect = filter_diffs 
        msg = six.text_type (self.assertRaises (AssertionError, self.test_models_sync)) 
        self.assertNotIn ('defaulttest', msg) 
        self.assertNotIn ('defaulttest3', filter_mock) 
        self.assertNotIn ('remove_fk', msg) 
        self.assertIn ('constraint', msg) 

    
    

    Fix the buggy line: self.assertNotIn ('defaulttest3', filter_mock)
assistant
#Here is Python code to fix the buggy line: self.

self.assertNotIn ('defaulttest3', msg)