public function testCustomErrorMessage()
{
$sql = "select * from invalid_table_name";
$statement = new Statement($sql, $this->connection);
$statement->execute();
$error = new Error($statement, 'my custom message');
$actual = $error->getErrorMessage();
$this->assertContains('my custom message', $actual);
$actual = $statement->getErrorMessage('another message');
$this->assertContains('another message', $actual);
}