The istsos test code seems broken since version 2.0. Please see a stack trace (edited) for reference. My understanding from code is that "prefetch" is removed after version 2.0
runAllTests.py", line 424, in <module> class RunAllTests(unittest.TestCase):
runAllTests.py", line 431, in RunAllTests run_tests(params)
runAllTests.py", line 140, in run_tests res = tput.PUT("", config, address)
\test\put.py", line 28, in PUT prefetch=True
File "\lib\requests\api.py", line 110, in put return request('put', url, data=data, kwargs)
File "\lib\requests\api.py", line 49, in request response = session.request(method=method, url=url, kwargs)
TypeError: request() got an unexpected keyword argument 'prefetch'</module>
Thanks for the ticket. We actually should consider a full review of the testing in the next istSOS version.