Some initial grant testing

tests/Stubs/StubAbstractGrant.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace LeagueTests\Stubs;
+
+class StubAbstractGrant extends \League\OAuth2\Server\Grant\AbstractGrant
+{
+    protected $responseType = 'foobar';
+
+    public function completeFlow()
+    {
+        return true;
+    }
+
+    public function getAccessTokenTTL()
+    {
+        return $this->accessTokenTTL;
+    }
+
+    public function getAuthorizationServer()
+    {
+        return $this->server;
+    }
+}