Merge pull request #29052 from NostradamusICTBV/5.5

Added return type to avoid errors in tests

Author: taylorotwell

src/Illuminate/Support/Testing/Fakes/MailFake.php

@@ -311,6 +311,6 @@ public function queue($view, $queue = null)
      */
     public function failures()
     {
-        //
+        return [];
     }
 }