MDL-66049 workshop: Fix the fully qualified class name

Because of the missing slash, the class 'workshop' was not found in the
current namespace and the cron failed to work.

mod/workshop/classes/task/cron_task.php

@@ -65,7 +65,7 @@ class cron_task extends \core\task\scheduled_task {
                 $cm = get_coursemodule_from_instance('workshop', $workshop->id, $workshop->course, false, MUST_EXIST);
                 $course = $DB->get_record('course', ['id' => $cm->course], '*', MUST_EXIST);
                 $workshop = new \workshop($workshop, $cm, $course);
-                $workshop->switch_phase(workshop::PHASE_ASSESSMENT);
+                $workshop->switch_phase(\workshop::PHASE_ASSESSMENT);
 
                 $params = [
                     'objectid' => $workshop->id,

mod/workshop/tests/cron_task_test.php

@@ -0,0 +1,76 @@
+<?php
+// This file is part of Moodle - https://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Provides the {@link mod_workshop_cron_task_testcase} class.
+ *
+ * @package     mod_workshop
+ * @category    test
+ * @copyright   2019 David Mudrák <[email protected]>
+ * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+global $CFG;
+
+require_once($CFG->dirroot.'/mod/workshop/lib.php');
+
+/**
+ * Test the functionality provided by  the {@link mod_workshop\task\cron_task} scheduled task.
+ *
+ * @copyright 2019 David Mudrák <[email protected]>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class mod_workshop_cron_task_testcase extends advanced_testcase {
+
+    /**
+     * Test that the phase is automatically switched after the submissions deadline.
+     */
+    public function test_phase_switching() {
+        global $DB;
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        // Set up a test workshop with 'Switch to the next phase after the submissions deadline' enabled.
+        $generator = $this->getDataGenerator();
+        $course = $generator->create_course();
+        $workshop = $generator->create_module('workshop', [
+            'course' => $course,
+            'name' => 'Test Workshop',
+        ]);
+
+        $DB->update_record('workshop', [
+            'id' => $workshop->id,
+            'phase' => workshop::PHASE_SUBMISSION,
+            'phaseswitchassessment' => 1,
+            'submissionend' => time() - 1,
+        ]);
+
+        // Execute the cron.
+        ob_start();
+        cron_setup_user();
+        $cron = new \mod_workshop\task\cron_task();
+        $cron->execute();
+        $output = ob_get_contents();
+        ob_end_clean();
+
+        // Assert that the phase has been switched.
+        $this->assertContains('Processing automatic assessment phase switch', $output);
+        $this->assertEquals(workshop::PHASE_ASSESSMENT, $DB->get_field('workshop', 'phase', ['id' => $workshop->id]));
+    }
+}