Add basic tests for PDOConnection and PDOStatement

[MAILPOET-3296]

tests/integration/Doctrine/Driver/PDOConnectionTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace MailPoet\Doctrine\Driver;
+
+use MailPoet\Doctrine\ConnectionFactory;
+
+require_once __DIR__ . '/DummyUser.php';
+
+class PDOConnectionTest extends \MailPoetTest {
+
+  /** @var PDOConnection */
+  private $testConnection;
+
+  public function _before() {
+    $this->testConnection = $this->diContainer->get(ConnectionFactory::class)->createConnection();
+  }
+
+  public function testItCanQuery() {
+    $statement = $this->testConnection->query("SELECT 'lojza' as name, 30 as age;");
+    expect($statement)->isInstanceOf(PDOStatement::class);
+
+    $statement = $this->testConnection->query("SELECT 'lojza' as name, 30 as age;", \PDO::FETCH_COLUMN, 2);
+    expect($statement)->isInstanceOf(PDOStatement::class);
+
+    $statement = $this->testConnection->query("SELECT 'lojza' as name, 30 as age;", \PDO::FETCH_CLASS, DummyUser::class, ['name', 'age']);
+    expect($statement)->isInstanceOf(PDOStatement::class);
+  }
+}