UnitTests are now located in tests directory & tiny improvements

tests/Fixtures/DummyServiceResponseWithAttachments.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Fixtures;
+
+use Fixtures\Attachment\AttachmentCollection;
+
+class DummyServiceResponseWithAttachments
+{
+    /**
+     * @var bool $status
+     */
+    public $status;
+
+    /**
+     * @var AttachmentCollection $attachmentCollection
+     */
+    public $attachmentCollection;
+
+    public function hasAttachments()
+    {
+        return $this->attachmentCollection !== null && $this->attachmentCollection->hasAttachments();
+    }
+}