- Extracts database configuration into a separate class

- Conditionally sets the session wait_timeout value
- Updates unit tests

tests/unit/Config/InitializerTest.php

@@ -1,25 +1,6 @@
 <?php
 
-use MailPoet\Config\Env;
-
 class InitializerTest extends MailPoetTest {
-  function testItSetsDBDriverOptions() {
-    $result = ORM::for_table("")
-      ->raw_query(
-        'SELECT ' .
-        '@@sql_mode as sql_mode, ' .
-        '@@session.time_zone as time_zone, ' .
-        '@@session.wait_timeout as wait_timeout'
-      )
-      ->findOne();
-    // disable ONLY_FULL_GROUP_BY
-    expect($result->sql_mode)->notContains('ONLY_FULL_GROUP_BY');
-    // time zone should be set based on WP's time zone
-    expect($result->time_zone)->equals(Env::$db_timezone_offset);
-    // connection timeout should be set to 60 seconds
-    expect($result->wait_timeout)->equals(60);
-  }
-
   function testItConfiguresHooks() {
     global $wp_filter;
     $is_hooked = false;
@@ -29,4 +10,4 @@ class InitializerTest extends MailPoetTest {
     }
     expect($is_hooked)->true();
   }
-}
+}