MDL-79638 phpunit: Add unit test for increment resets

lib/testing/tests/util_test.php

@@ -0,0 +1,80 @@
+<?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/>.
+
+namespace core\testing;
+
+/**
+ * Testing util tests.
+ *
+ * @package    core
+ * @category   phpunit
+ * @copyright  2023 Andrew Lyons <andrew@nicols.co.uk>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class util_test extends \advanced_testcase {
+    /**
+     * Note: This test is required for the other two parts because the first time
+     * a table is written to it may not have had the initial value reset.
+     *
+     * @coversNothing
+     */
+    public function test_increment_reset_part_one(): void {
+        global $DB;
+
+        switch ($DB->get_dbfamily()) {
+            case 'mssql':
+                $this->markTestSkipped('MSSQL does not support sequences');
+                return;
+        }
+
+        $this->resetAfterTest();
+        $DB->insert_record('config_plugins', [
+            'plugin' => 'example',
+            'name' => 'test_increment',
+            'value' => 0,
+        ]);
+    }
+
+    /**
+     * @coversNothing
+     * @depends test_increment_reset_part_one
+     */
+    public function test_increment_reset_part_two(): int {
+        global $DB;
+
+        $this->resetAfterTest();
+        return $DB->insert_record('config_plugins', [
+            'plugin' => 'example',
+            'name' => 'test_increment',
+            'value' => 0,
+        ]);
+    }
+
+    /**
+     * @depends test_increment_reset_part_two
+     */
+    public function test_increment_reset_part_three(int $previousid): void {
+        global $DB;
+
+        $this->resetAfterTest();
+        $id = $DB->insert_record('config_plugins', [
+            'plugin' => 'example',
+            'name' => 'test_increment',
+            'value' => 0,
+        ]);
+        $this->assertEquals($previousid, $id);
+    }
+}