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If a user calls PHPUnit_Framework_Testcase::getMockFromWsdl() they may get a mock generated from an old version of the WSDL file. This causes issues when the WSDL is in active development alongside the current code.
This calls PHPUnit_Framework_MockObject_Generator::generateClassFromWsdl() without populating the $options parameter, so when the generator does new SoapClient($wsdl, $options) it is not sending any sensible value for the cache_wsdl option.
I think even if this option isn't made user-settable, it should default to not caching.