diff --git a/mod/lesson/tests/locallib_test.php b/mod/lesson/tests/locallib_test.php
new file mode 100644
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+++ b/mod/lesson/tests/locallib_test.php
@@ -0,0 +1,79 @@
+<?php
+// This file is part of Moodle - http://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/>.
+
+/**
+ * locallib tests.
+ *
+ * @package    mod_lesson
+ * @category   test
+ * @copyright  2016 Adrian Greeve <adrian@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+global $CFG;
+
+require_once($CFG->dirroot.'/mod/lesson/locallib.php');
+
+/**
+ * locallib testcase.
+ *
+ * @package    mod_lesson
+ * @category   test
+ * @copyright  2016 Adrian Greeve <adrian@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class mod_lesson_locallib_testcase extends advanced_testcase {
+
+    /**
+     * Test duplicating a lesson page element.
+     */
+    public function test_duplicate_page() {
+        global $DB;
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+        $course = $this->getDataGenerator()->create_course();
+        $lessonmodule = $this->getDataGenerator()->create_module('lesson', array('course' => $course->id));
+        // Convert to a lesson object.
+        $lesson = new lesson($lessonmodule);   
+
+        // Set up a generator to create content.
+        $generator = $this->getDataGenerator()->get_plugin_generator('mod_lesson');
+        $tfrecord = $generator->create_question_truefalse($lesson);
+        $lesson->duplicate_page($tfrecord->id);
+
+        // Lesson pages.
+        $records = $DB->get_records('lesson_pages', array('qtype' => 2));
+        $sameelements = array('lessonid', 'qtype', 'qoption', 'layout', 'display', 'title', 'contents', 'contentsformat');
+        $baserecord = array_shift($records);
+        $secondrecord = array_shift($records);
+        foreach ($sameelements as $element) {
+            $this->assertEquals($baserecord->$element, $secondrecord->$element);
+        }
+        // Need lesson answers as well.
+        $baserecordanswers = array_values($DB->get_records('lesson_answers', array('pageid' => $baserecord->id)));
+        $secondrecordanswers = array_values($DB->get_records('lesson_answers', array('pageid' => $secondrecord->id)));
+        $sameanswerelements = array('lessonid', 'jumpto', 'grade', 'score', 'flags', 'answer', 'answerformat', 'response',
+                'responseformat');
+        foreach ($baserecordanswers as $key => $baseanswer) {
+            foreach ($sameanswerelements as $element) {
+                $this->assertEquals($baseanswer->$element, $secondrecordanswers[$key]->$element);
+            }
+        }
+    }
+}