+ Add the unit test for getting MRs by API.

module/gitlab/test/model/apigetmergerequests.php

@@ -0,0 +1,22 @@
+#!/usr/bin/env php
+<?php
+include dirname(__FILE__, 5) . '/test/lib/init.php';
+
+/**
+
+title=测试 gitlabModel::apiGetMergeRequests();
+timeout=0
+cid=1
+
+*/
+
+zenData('pipeline')->gen(4);
+
+$gitlab = $tester->loadModel('gitlab');
+
+$gitlabID  = 1;
+$projectID = 18;
+
+$result = $gitlab->apiGetMergeRequests($gitlabID, $projectID);
+r(isset($result[0]->iid)) && p() && e('1'); // 验证获取的第一个合并请求是否含有iid属性
+r(count($result) > 0)     && p() && e('1'); // 验证获取的合并请求数量是否大于0