add configuration for code coverage generation (#135)

tests/coverage.php

@@ -0,0 +1,50 @@
+<?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/>.
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Coverage information for the qtype_formulas
+ *
+ * @package    qtype_formulas
+ * @copyright  2023 Philipp Imhof
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+return new class extends phpunit_coverage_info {
+    /** @var array list of folders to include in coverage generation. */
+    protected $includelistfolders = ['.'];
+
+    /** @var array list of files to include in coverage generation. */
+    protected $includelistfiles = [];
+
+    /** @var array list of folders to exclude from coverage generation. */
+    protected $excludelistfolders = [
+        'tests',
+        'lang'
+    ];
+
+    /** @var array list of files to exclude from coverage generation. */
+    protected $excludelistfiles = [
+        'classes/output/mobile.php',
+        'classes/privacy/provider.php',
+        'db/mobile.php',
+        'db/services.php',
+        'db/upgrade.php',
+        'lib.php',
+        'settings.php',
+        'version.php',
+    ];
+};