'Test switch user for TestInfluxDBClient object.'

def test_switch_user(self):

    cli = InfluxDBClient('host', 8086, 'username', 'password', 'database')
    cli.switch_user('another_username', 'another_password')
    self.assertEqual(cli._username, 'another_username')
    self.assertEqual(cli._password, 'another_password')
