How can I test testcase for [Phalcon DB] error?

I wanna test testcase for PhalconDB error.

But I cannot operate source code for generating ones error.

I wanna generate error about Database(fx: connection error, transaction is not active....) without operating Source.

And more, I wanna generate error when my own timing(fx: If I am operating five table in database, generating error in index 3 table only.)

How solve this test? Is there something appropriate test tool??

Tell me both.

ExampleSource:(below)

$table_list = 
  [
    'tableOne' => "table_one",
    'tableTwo' => "table_two",
    'tableThree' => "table_three",
    'tableFour' => "table_four",
    'tableFive' => "table_five"
  ];
foreach($table_list as $key => $table_name) {
    try {
    // transaction:start
    $this->db->begin();
    $this->db
    ->delete(
        $table_name,
        "post_date < '{$dead_line_date}' and perms_flg = 1"
    );
    } catch (\PDOException $e) {
        $this->logger->error($this->formatExceptionMessage($this, $e, $log = $key."is failed."));
    }
    // Transaction:commit
    $this->db->commit();

}