Make cache static for https://github.com/sebastianbergmann/phpunit/issues/1187
Make cache static for https://github.com/sebastianbergmann/phpunit/issues/1187

PeeHaa/phpunit-mock-objects,awhale/phpunit-mock-objects,Darhazer/phpunit-mock-objects,stefk/phpunit-mock-objects,JeroenDeDauw/phpunit-mock-objects