test(config): add test for config files using only per-capability specs
test(config): add test for config files using only per-capability specs

To prevent bugs like #2925 in the future.

jlin412/protractor,sirwalt/protractor,manoj9788/protractor,manoj9788/protractor,sjelin/protractor,mgiambalvo/protractor,marleitao/protractor,marleitao/protractor,fancyhejianyang/protractor-operation,Everworks/protractor,igniteram/protractor,sjelin/protractor,marleitao/protractor,sjelin/protractor,xaka/protractor,jcapozzi/protractor,cnishina/protractor,telefonicaid/protractor,sirwalt/protractor,NickTomlin/protractor,angular/protractor,onshape/protractor,fancyhejianyang/protractor-operation,jcapozzi/protractor,telefonicaid/protractor,jcapozzi/protractor,onshape/protractor,xaka/protractor,angular/protractor,cnishina/protractor,sirwalt/protractor,onshape/protractor,NickTomlin/protractor,angular/protractor,onshape/protractor,jlin412/protractor,fancyhejianyang/protractor-operation,Everworks/protractor,telefonicaid/protractor,NickTomlin/protractor,manoj9788/protractor,igniteram/protractor,jlin412/protractor,fancyhejianyang/protractor-operation,cnishina/protractor,igniteram/protractor,xaka/protractor,sjelin/protractor,xaka/protractor,jcapozzi/protractor,igniteram/protractor,NickTomlin/protractor,Everworks/protractor,Everworks/protractor,mgiambalvo/protractor,marleitao/protractor,mgiambalvo/protractor,sirwalt/protractor,mgiambalvo/protractor,cnishina/protractor,manoj9788/protractor,jlin412/protractor,angular/protractor