Add a test case for nested events, this tests 8cb3706d

_test/tests/inc/events_nested.test.php

+<?php
+
+/**
+ * This tests if event handlers can trigger the same event again.
+ * This is used by plugins that modify cache handling and use metadata
+ * for checking cache validity which triggers another cache use event.
+ */
+class events_nested_test extends DokuWikiTest {
+    function test_nested_events() {
+        global $EVENT_HANDLER;
+        $firstcount = 0;
+        $secondcount = 0;
+
+        $EVENT_HANDLER->register_hook('NESTED_EVENT', 'BEFORE', null,
+            function() use (&$firstcount) {
+                $firstcount++;
+                if ($firstcount == 1) {
+                    $param = array();
+                    trigger_event('NESTED_EVENT', $param);
+                }
+            }
+        );
+
+        $EVENT_HANDLER->register_hook('NESTED_EVENT', 'BEFORE', null,
+            function() use (&$secondcount) {
+                $secondcount++;
+            }
+        );
+
+        $param = array();
+        trigger_event('NESTED_EVENT', $param);
+
+        $this->assertEquals(2, $firstcount);
+        $this->assertEquals(2, $secondcount);
+    }
+}