diff --git a/backup/util/helper/tests/restore_log_rule_test.php b/backup/util/helper/tests/restore_log_rule_test.php
new file mode 100644
index 00000000000..03d016b0216
--- /dev/null
+++ b/backup/util/helper/tests/restore_log_rule_test.php
@@ -0,0 +1,52 @@
+<?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/>.
+
+/**
+ * @package    core_backup
+ * @category   test
+ * @copyright  2015 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();
+
+// Include all the needed stuff
+global $CFG;
+require_once($CFG->dirroot . '/backup/util/includes/restore_includes.php');
+
+
+class backup_restore_log_rule_testcase extends basic_testcase {
+
+    function test_process_keeps_log_unmodified() {
+
+        // Prepare a tiny log entry.
+        $originallog = new stdClass();
+        $originallog->url = 'original';
+        $originallog->info = 'original';
+        $log = clone($originallog);
+
+        // Process it with a tiny log rule, only modifying url and info.
+        $lr = new restore_log_rule('test', 'test', 'changed', 'changed');
+        $result = $lr->process($log);
+
+        // The log has been processed.
+        $this->assertEquals('changed', $result->url);
+        $this->assertEquals('changed', $result->info);
+
+        // But the original log has been kept unmodified by the process() call.
+        $this->assertEquals($originallog, $log);
+    }
+}