Fixes improper return from Xcache::clear();

Adds test
see #6110

git-svn-id: https://svn.cakephp.org/repo/branches/1.2.x.x@8046 3807eeeb-6ff5-0310-8944-8be069107fe0

cake/libs/cache/xcache.php

@@ -107,12 +107,12 @@ function delete($key) {
  */
 	function clear() {
 		$this->__auth();
-		for ($i = 0, $max = xcache_count(XC_TYPE_VAR); $i < $max; $i++) {
+		$max = xcache_count(XC_TYPE_VAR);
+		for ($i = 0; $i < $max; $i++) {
 			xcache_clear_cache(XC_TYPE_VAR, $i);
 		}
-		$result = xcache_count(XC_TYPE_VAR) == 0;
 		$this->__auth(true);
-		return $result;
+		return true;
 	}
 /**
  * Populates and reverses $_SERVER authentication values

cake/tests/cases/libs/cache/xcache.test.php

@@ -139,6 +139,23 @@ function testDeleteCache() {
 		$result = Cache::delete('delete_test');
 		$this->assertTrue($result);
 	}
+/**
+ * testClearCache method
+ *
+ * @access public
+ * @return void
+ */
+	function testClearCache() {
+		$data = 'this is a test of the emergency broadcasting system';
+		$result = Cache::write('clear_test_1', $data);
+		$this->assertTrue($result);
+
+		$result = Cache::write('clear_test_2', $data);
+		$this->assertTrue($result);
+
+		$result = Cache::clear();
+		$this->assertTrue($result);
+	}
 /**
  * tearDown method
  *