diff --git a/mod/assign/tests/lib_test.php b/mod/assign/tests/lib_test.php
new file mode 100644
index 00000000000..7e4e9f035e9
--- /dev/null
+++ b/mod/assign/tests/lib_test.php
@@ -0,0 +1,220 @@
+<?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/>.
+
+/**
+ * Unit tests for (some of) mod/assign/lib.php.
+ *
+ * @package    mod_assign
+ * @category   phpunit
+ * @copyright  1999 onwards Martin Dougiamas  {@link http://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/assign/lib.php');
+require_once($CFG->dirroot . '/mod/assign/locallib.php');
+
+/**
+ * Unit tests for (some of) mod/assign/lib.php.
+ *
+ * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class mod_assign_lib_testcase extends advanced_testcase {
+
+    /** @var stdClass $course New course created to hold the assignments */
+    protected $course = null;
+
+    /** @var array $teachers List of 5 default teachers in the course*/
+    protected $teachers = null;
+
+    /** @var array $editingteachers List of 5 default editing teachers in the course*/
+    protected $editingteachers = null;
+
+    /** @var array $students List of 100 default students in the course*/
+    protected $students = null;
+
+    /** @var array $groups List of 10 groups in the course */
+    protected $groups = null;
+
+    /**
+     * Setup function - we will create a course and users.
+     */
+    protected function setUp() {
+        global $DB, $CFG;
+
+        $this->resetAfterTest(true);
+
+        $this->course = $this->getDataGenerator()->create_course();
+        $this->teachers = array();
+        for ($i = 0; $i < 5; $i++) {
+            array_push($this->teachers, $this->getDataGenerator()->create_user());
+        }
+
+        $this->editingteachers = array();
+        for ($i = 0; $i < 5; $i++) {
+            array_push($this->editingteachers, $this->getDataGenerator()->create_user());
+        }
+
+        $this->students = array();
+        for ($i = 0; $i < 100; $i++) {
+            array_push($this->students, $this->getDataGenerator()->create_user());
+        }
+
+        $this->groups = array();
+        for ($i = 0; $i < 10; $i++) {
+            array_push($this->groups, $this->getDataGenerator()->create_group(array('courseid'=>$this->course->id)));
+        }
+
+        $teacherrole = $DB->get_record('role', array('shortname'=>'teacher'));
+        foreach ($this->teachers as $i => $teacher) {
+            $this->getDataGenerator()->enrol_user($teacher->id,
+                                                  $this->course->id,
+                                                  $teacherrole->id);
+            groups_add_member($this->groups[$i % 10], $teacher);
+        }
+
+        $editingteacherrole = $DB->get_record('role', array('shortname'=>'editingteacher'));
+        foreach ($this->editingteachers as $i => $editingteacher) {
+            $this->getDataGenerator()->enrol_user($editingteacher->id,
+                                                  $this->course->id,
+                                                  $editingteacherrole->id);
+            groups_add_member($this->groups[$i % 10], $editingteacher);
+        }
+
+        $studentrole = $DB->get_record('role', array('shortname'=>'student'));
+        foreach ($this->students as $i => $student) {
+            $this->getDataGenerator()->enrol_user($student->id,
+                                                  $this->course->id,
+                                                  $studentrole->id);
+            if ($i < 80) {
+                groups_add_member($this->groups[$i % 10], $student);
+            }
+        }
+    }
+
+    /**
+     * Create an assignment in the current course.
+     *
+     * @param array $params - A list of params used to configure the assignment
+     * @return assign class
+     */
+    private function create_instance($params=array()) {
+        $this->setUser($this->editingteachers[0]);
+        $generator = $this->getDataGenerator()->get_plugin_generator('mod_assign');
+        $params['course'] = $this->course->id;
+        $instance = $generator->create_instance($params);
+        $cm = get_coursemodule_from_instance('assign', $instance->id);
+        $context = context_module::instance($cm->id);
+        return new assign($context, $cm, $this->course);
+    }
+
+    public function test_assign_print_overview() {
+        $this->create_instance();
+        $this->create_instance(array('duedate'=>time()));
+
+        $this->setUser($this->students[0]);
+        $overview = array();
+        assign_print_overview(array($this->course->id => $this->course), $overview);
+        $this->assertEquals(count($overview), 1);
+
+        $this->setUser($this->teachers[0]);
+        $overview = array();
+        assign_print_overview(array($this->course->id => $this->course), $overview);
+        $this->assertEquals(count($overview), 1);
+
+        $this->setUser($this->editingteachers[0]);
+        $overview = array();
+        assign_print_overview(array($this->course->id => $this->course), $overview);
+        $this->assertEquals(1, count($overview));
+    }
+
+    public function test_print_recent_activity() {
+        $assign = $this->create_instance();
+
+        $submission = $assign->get_user_submission($this->students[0]->id, true);
+
+        $this->expectOutputRegex('/submitted:/');
+        assign_print_recent_activity($this->course, true, time() - 3600);
+    }
+
+    public function test_assign_get_recent_mod_activity() {
+        $assign = $this->create_instance();
+
+        $submission = $assign->get_user_submission($this->students[0]->id, true);
+
+        $activities = array();
+        $index = 0;
+
+        $activity = new stdClass();
+        $activity->type    = 'activity';
+        $activity->cmid    = $assign->get_course_module()->id;
+        $activities[$index++] = $activity;
+
+        assign_get_recent_mod_activity( $activities,
+                                        $index,
+                                        time() - 3600,
+                                        $this->course->id,
+                                        $assign->get_course_module()->id);
+
+        $this->assertEquals("assign", $activities[1]->type);
+    }
+
+    public function test_assign_user_complete() {
+        $assign = $this->create_instance(array('submissiondrafts' => 1));
+
+        $submission = $assign->get_user_submission($this->students[0]->id, true);
+
+
+        $this->expectOutputRegex('/Draft/');
+        assign_user_complete($this->course, $this->students[0], $assign->get_course_module(), $assign->get_instance());
+
+    }
+
+    public function test_assign_user_outline() {
+        $assign = $this->create_instance();
+
+        $this->setUser($this->teachers[0]);
+        $data = $assign->get_user_grade($this->students[0]->id, true);
+        $data->grade = '50.0';
+        $assign->update_grade($data);
+
+        $result = assign_user_outline($this->course, $this->students[0], $assign->get_course_module(), $assign->get_instance());
+
+        $this->assertRegExp('/50.0/', $result->info);
+    }
+
+    public function test_assign_get_completion_state() {
+        global $DB;
+        $assign = $this->create_instance(array('submissiondrafts'=>0, 'completionsubmit'=>1));
+
+        $this->setUser($this->students[0]);
+        $result = assign_get_completion_state($this->course, $assign->get_course_module(), $this->students[0]->id, false);
+        $this->assertFalse($result);
+        $submission = $assign->get_user_submission($this->students[0]->id, true);
+        $submission->status = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
+        $DB->update_record('assign_submission', $submission);
+
+        $result = assign_get_completion_state($this->course, $assign->get_course_module(), $this->students[0]->id, false);
+
+        $this->assertTrue($result);
+    }
+
+}
+