diff --git a/tests/base_test.php b/tests/base_test.php
new file mode 100644
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--- /dev/null
+++ b/tests/base_test.php
@@ -0,0 +1,107 @@
+<?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/>.
+
+/**
+ * Base class for unit tests for mod_assign.
+ *
+ * @package    blocks_completion_progress
+ * @category   phpunit
+ * @copyright  2017 onwards Nelson Moller  {@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/locallib.php');
+
+class mod_assign_base_testcase extends advanced_testcase {
+
+    /** @const Default number of students to create */
+    const DEFAULT_STUDENT_COUNT = 3;
+    /** @const Default number of teachers to create */
+    const DEFAULT_TEACHER_COUNT = 1;
+
+    /**
+     * Setup function - we will create a course and add an assign instance to it.
+     */
+    protected function setUp() {
+        global $DB;
+
+        $this->resetAfterTest(true);
+
+        set_config('enablecompletion', 1);
+
+        $this->course = $this->getDataGenerator()->create_course(array('enablecompletion' => 1));
+        $this->teachers = array();
+        for ($i = 0; $i < self::DEFAULT_TEACHER_COUNT; $i++) {
+            array_push($this->teachers, $this->getDataGenerator()->create_user());
+        }
+
+        $this->students = array();
+        for ($i = 0; $i < self::DEFAULT_STUDENT_COUNT; $i++) {
+            array_push($this->students, $this->getDataGenerator()->create_user());
+        }
+
+
+        $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);
+        }
+
+
+        $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);
+        }
+    }
+
+    /**
+     * Convenience function to create a testable instance of an assignment.
+     *
+     * @param array $params Array of parameters to pass to the generator
+     * @return testable_assign Testable wrapper around the assign class.
+     */
+    protected function create_instance($params=array()) {
+        $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_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);
+    }
+}
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