@Override
    public boolean isValid(final int timeout) throws SQLException {
        return databaseConnectionManager.isValid(timeout);
    }
@Test
    void assertIsValidWhenEmptyConnection() throws SQLException {
        try (ShardingSphereConnection connection = new ShardingSphereConnection(DefaultDatabase.LOGIC_NAME, mockContextManager())) {
            assertTrue(connection.isValid(0));
        }
    }