报错:

Class 'XHProfRuns_Default' not found

说明你没有按测试用例引用对应的lib~
需要拷贝源码里的xhprof_lib过去并引用,示例:

    include_once $XHPROF_ROOT . "/xhprof_lib/utils/xhprof_lib.php";
include_once $XHPROF_ROOT . "/xhprof_lib/utils/xhprof_runs.php";

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