猜测是部分用例在setUpClass就抛出异常，导致runner无法正常工作

[bluesnoblue]

File "xxxxx\HTMLTestReportCN.py", line 518, in addError
output = self.complete_output()
File "xxxxx\HTMLTestReportCN.py", line 492, in complete_output
return self.outputBuffer.getvalue()
AttributeError: '_TestResult' object has no attribute 'outputBuffer'