Add DoiLookup test.

module/VuFind/tests/unit-tests/src/VuFindTest/AjaxHandler/DoiLookupTest.php

+<?php
+/**
+ * DoiLookup test class.
+ *
+ * PHP version 7
+ *
+ * Copyright (C) Villanova University 2018.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * @category VuFind
+ * @package  Tests
+ * @author   Demian Katz <demian.katz@villanova.edu>
+ * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
+ * @link     https://vufind.org Main Page
+ */
+namespace VuFindTest\AjaxHandler;
+
+use VuFind\AjaxHandler\DoiLookup;
+use VuFind\AjaxHandler\DoiLookupFactory;
+use VuFind\Config\PluginManager as ConfigManager;
+use VuFind\DoiLinker\DoiLinkerInterface;
+use VuFind\DoiLinker\PluginManager;
+use Zend\Config\Config;
+
+/**
+ * DoiLookup test class.
+ *
+ * @category VuFind
+ * @package  Tests
+ * @author   Demian Katz <demian.katz@villanova.edu>
+ * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
+ * @link     https://vufind.org Main Page
+ */
+class DoiLookupTest extends \VuFindTest\Unit\AjaxHandlerTest
+{
+    /**
+     * Test a DOI lookup.
+     *
+     * @return void
+     */
+    public function testLookup()
+    {
+        // Set up config manager:
+        $config = new Config(['DOI' => ['resolver' => 'foo']]);
+        $cm = $this->container->createMock(ConfigManager::class, ['get']);
+        $cm->expects($this->once())->method('get')->with($this->equalTo('config'))
+            ->will($this->returnValue($config));
+        $this->container->set(ConfigManager::class, $cm);
+
+        // Set up plugin manager:
+        $pm = new PluginManager($this->container);
+        $mockPlugin = $this->container
+            ->createMock(DoiLinkerInterface::class, ['getLinks']);
+        $mockPlugin->expects($this->once())->method('getLinks')
+            ->with($this->equalTo(['bar']))
+            ->will($this->returnValue(['bar' => 'baz']));
+        $pm->setService('foo', $mockPlugin);
+        $this->container->set(PluginManager::class, $pm);
+
+        // Test the handler:
+        $factory = new DoiLookupFactory();
+        $handler = $factory($this->container, DoiLookup::class);
+        $params = $this->getParamsHelper(['doi' => ['bar']]);
+        $this->assertEquals([['bar' => 'baz']], $handler->handleRequest($params));
+    }
+}