Add testing for php warnings

errors.php

@@ -52,6 +52,8 @@
 
 <h3>PHP level errors and setup</h3>
 <p>These are errors are awkward to theme because they can appear in the middle of a themed page</p>
+<li>A 200 page which emits a notice and a warning
+    <a href='errors/phpwarnings.php'>phpwarnings.php</a></li>
 <li>A 200 unthemed moodle script which 'Fatal errors' times out after 1 second
     <a href='errors/moodletimeout.php'>moodletimeout.php</a></li>
 <li>A 200 unthemed moodle script which 'Fatal errors' times out after exceding memory

errors/phpwarnings.php

@@ -0,0 +1,41 @@
+<?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/>.
+
+/**
+ * Tests all the different types of error classes
+ *
+ * @package    tool_heartbeat
+ * @copyright  2024 Brendan Heywood <brendan@catalyst-au.net>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+define('NO_OUTPUT_BUFFERING', true);
+
+// @codingStandardsIgnoreStart
+require(__DIR__ . '/../../../../config.php');
+// @codingStandardsIgnoreEnd
+
+// So we don't brick our session.
+\core\session\manager::write_close();
+
+echo "This is an ok page which emits notices and warnings, and error logs";
+
+trigger_error("This is a notice", E_USER_NOTICE);
+trigger_error("This is a warning", E_USER_WARNING);
+
+error_log("This is an error_log");
+file_put_contents("php://stderr", "This writing to php://stderr");
+