public void test_error_5() throws Exception {
    DruidPooledConnection conn = dataSource.getConnection().unwrap(DruidPooledConnection.class);

    conn.close();

    dataSource.setInitialSize(dataSource.getInitialSize());

    {
      Exception error = null;
      try {
        dataSource.setInitialSize(10);
      } catch (Exception ex) {
        error = ex;
      }
      Assert.assertNotNull(error);
    }
  }