[Web][Tests] Add PHPUnit setup and imapsync module tests

tests/php/Support/legacy_acl_functions.php

@@ -0,0 +1,22 @@
+<?php
+
+// Stand-ins for the legacy ACL functions of data/web/inc/functions.inc.php, used by ContextTest only:
+// they record the call and answer from a fixed table.
+
+use Mailcow\Tests\Support\LegacyAclCalls;
+
+if (!function_exists('hasMailboxObjectAccess')) {
+    function hasMailboxObjectAccess($username, $role, $object)
+    {
+        LegacyAclCalls::$calls[] = ['mailbox', $username, $role, $object];
+        return $object === 'allowed@example.org';
+    }
+}
+
+if (!function_exists('hasDomainAccess')) {
+    function hasDomainAccess($username, $role, $domain)
+    {
+        LegacyAclCalls::$calls[] = ['domain', $username, $role, $domain];
+        return $domain === 'example.org';
+    }
+}