Stale cache unittest

_test/tests/inc/cache_stalecheck.test.php

+<?php
+
+require_once DOKU_INC . 'inc/parserutils.php';
+
+class cache_stalecheck_test extends DokuWikiTest {
+	function test_staleness() {
+		global $ID;
+
+		$ID = 'stale';
+		$file = wikiFN($ID);
+
+		# Prepare test page
+		saveWikiText($ID, 'Fresh', 'Created');
+
+		# Create stale cache
+		$cache = new cache_renderer($ID, $file, 'xhtml');
+		$cache->storeCache('Stale');
+		$stale = $cache->retrieveCache();
+
+		# Prepare stale cache for testing
+		$time = filemtime($file);
+		touch($cache->cache, $time);
+
+		# Make the test
+		$fresh = p_cached_output($file, 'xhtml', $ID);
+		$this->assertNotEquals($fresh, $stale, 'Stale cache failed to expire');
+	}
+}
+?>