超级棒，已经调通了，以前写的测试代码可以用了，想给楼主一百个赞。

中间遇到过
Testing failed:
Test target WebDriverAgentRunner encountered an error (Early unexpected exit, operation never finished bootstrapping - no restart will be attempted)
** TEST FAILED **
其实是需要等待一段时间，到 log 出到：
Test Suite 'All tests' started at 2017-02-21 17:23:31.790
Test Suite 'WebDriverAgentRunner.xctest' started at 2017-02-21 17:23:31.795
Test Suite 'UITestingUITests' started at 2017-02-21 17:23:31.797
Test Case '-[UITestingUITests testRunner]' started.
t = 0.00s Start Test at 2017-02-21 17:23:31.803
t = 0.01s Set Up
再继续下面的步骤就没有问题了。