Add unit test for archiveorg plugin

+ coding style

plugins/archiveorg/archiveorg.php

@@ -1,12 +1,19 @@
 <?php
+/**
+ * Plugin Archive.org.
+ *
+ * Add an icon in the link list for archive.org.
+ */
 
 /**
  * Add archive.org icon to link_plugin when rendering linklist.
  *
- * @param $data - linklist data.
+ * @param mixed $data - linklist data.
+ *
  * @return mixed - linklist data with archive.org plugin.
  */
-function hook_archiveorg_render_linklist($data) {
+function hook_archiveorg_render_linklist($data)
+{
     $archive_html = file_get_contents(PluginManager::$PLUGINS_PATH . '/archiveorg/archiveorg.html');
 
     foreach ($data['links'] as &$value) {

tests/plugins/PluginArchiveorgTest.php

@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * PluginArchiveorgTest.php
+ */
+
+require_once 'plugins/archiveorg/archiveorg.php';
+
+/**
+ * Class PlugQrcodeTest
+ * Unit test for the QR-Code plugin
+ */
+class PluginArchiveorgTest extends PHPUnit_Framework_TestCase
+{
+    /**
+     * Reset plugin path
+     */
+    function setUp()
+    {
+        PluginManager::$PLUGINS_PATH = 'plugins';
+    }
+
+    /**
+     * Test render_linklist hook.
+     */
+    function testArchiveorgLinklist()
+    {
+        $str = 'http://randomstr.com/test';
+        $data = array(
+            'title' => $str,
+            'links' => array(
+                array(
+                    'url' => $str,
+                )
+            )
+        );
+
+        $data = hook_archiveorg_render_linklist($data);
+        $link = $data['links'][0];
+        // data shouldn't be altered
+        $this->assertEquals($str, $data['title']);
+        $this->assertEquals($str, $link['url']);
+
+        // plugin data
+        $this->assertEquals(1, count($link['link_plugin']));
+        $this->assertNotFalse(strpos($link['link_plugin'][0], $str));
+    }
+}