fixes #36

Author: chamav

src/MailRecorder.php

@@ -21,9 +21,9 @@ class MailRecorder implements Swift_Events_EventListener
     /**
      * MailRecorder constructor.
      *
-     * @param PHPUnit_Framework_TestCase $test
+     * @param $test
      */
-    public function __construct(PHPUnit_Framework_TestCase $test)
+    public function __construct($test)
     {
         $this->test = $test;
     }

src/MailTracking.php

@@ -48,8 +48,10 @@ trait MailTracking
      */
     public function setUpMailTracking()
     {
-        Mail::getSwiftMailer()
-            ->registerPlugin(new MailRecorder($this));
+        $this->afterApplicationCreated(function() {
+            Mail::getSwiftMailer()
+                ->registerPlugin(new MailRecorder($this));
+        });
     }
 
     /**