fixed testing

Author: JanHuang

tests/ServerTest.php

@@ -37,7 +37,7 @@ public function testServerBootstrap()
         $server->bootstrap();
         $this->assertEquals(get_local_ip(), $server->getSwoole()->host);
         $this->assertEquals(9527, $server->getSwoole()->port);
-        $this->assertEquals(getcwd() . '/var/run/foo.pid', $server->getPid());
+        $this->assertEquals('/tmp/foo.pid', $server->getPid());
         $this->assertEquals([
             'daemonize' => true
         ], $server->getSwoole()->setting);