Testing the untestable: Bad retry code

bad-retry-code.php

<?php
$pdo = $this->connect();
$stmt = $pdo->prepare('SELECT …');
while (true) {
  try {
    $stmt->execute();
    while ($row = $stmt->fetch()) {
      write_row_to_csv($row);
    }
    break; //success
  } catch (\Throwable $e) {
    $retries++;
    if ($retries > 10) {
      throw new \Exception('failed to retry');
    }
    sleep(10);
    $pdo = $this->connect();
  }
}