MDL-39005 unittest: add the upgradelib test template.

lib/tests/upgradelib_test.php

@@ -0,0 +1,45 @@
+<?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 the lib/upgradelib.php library
+ *
+ * @package   core
+ * @category  phpunit
+ * @copyright 2013 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+global $CFG;
+require_once($CFG->libdir.'/upgradelib.php');
+
+
+/**
+ * Tests various classes and functions in upgradelib.php library
+ */
+class upgradelib_test extends advanced_testcase {
+
+    /**
+     * Test the {@link upgrade_stale_php_files_present() function
+     */
+    public function test_upgrade_stale_php_files_present() {
+        // Just call the function, must return bool false always
+        // if there aren't any old files in the codebase.
+        $this->assertFalse(upgrade_stale_php_files_present());
+    }
+}