Added database mock for resource tests

tests/resource/database_mock.php

@@ -0,0 +1,29 @@
+<?php
+
+use Oauth2\Resource\Server;
+
+class ResourceDB implements Database
+{
+	private $accessTokens = array('test12345' => array(
+		'id'	=>	1,
+		'owner_type'	=>	'user',
+		'owner_id'	=>	123
+	));
+
+	private $sessionScopes = array(
+		1	=>	array(
+			'foo',
+			'bar'
+		)
+	);
+
+	public function validateAccessToken($accessToken)
+	{
+		return (isset($this->accessTokens[$accessToken])) ? $this->accessTokens[$accessToken] : false;
+	}
+
+	public function sessionScopes($sessionId)
+	{
+		return (isset($this->sessionScopes[$sessionId])) ? $this->sessionScopes[$sessionId] : array();
+	}
+}