PTL test case fails before setUp function with AttributeError

If we have erroneous code(Function which fails with error) inside class in a test suite, then other test cases also fail when it is run with -t option.

This is observed on Cray platform.

This machine doesn't have apstat installed in it and all Cray related test suits fail if apstat doesn't exist.

In my case, I was running pbs_cray_smoke_test.py.

I got error as below:

File "/tmp/ptl_test/lib/python2.7/site-packages/nose/proxy.py", line 131, in addError
plugins.addError(self.test, err)
File "/tmp/ptl_test/lib/python2.7/site-packages/nose/plugins/manager.py", line 99, in call
return self.call(*arg, **kw)
File "/tmp/ptl_test/lib/python2.7/site-packages/nose/plugins/manager.py", line 167, in simple
result = meth(*arg, **kw)
File "/tmp/ptl_test/lib/python2.7/site-packages/ptl/utils/plugins/ptl_test_db.py", line 1801, in addError
self._dbconn.write(self._create_data(test, err, 'ERROR'))
File "/tmp/ptl_test/lib/python2.7/site-packages/ptl/utils/plugins/ptl_test_db.py", line 1628, in write
self.__write_test_data(data['testdata'])
File "/tmp/ptl_test/lib/python2.7/site-packages/ptl/utils/plugins/ptl_test_db.py", line 1620, in __write_test_data
jsondata = self.res_data.get_json(data=data, prev_data=jdata)
File "/tmp/ptl_test/lib/python2.7/site-packages/ptl/utils/plugins/ptl_report_json.py", line 69, in get_json
'run_id': data['start_time'].strftime('%s'),
AttributeError: 'int' object has no attribute 'strftime'

After further anaysis it is found that pbs_cray_suspend_resume.py test suite has CrayUtils function called inside class and this class internally runs apstat command which was failing before even starting of actual test case to be run.