Fix the idf cache test
Fix the idf cache test

Test was mistakenly an "if" statement instead of a jasmine "it"
Index parameter was incorrect on the addFileSync calls

itamayo/natural,levy5674/natural,walkingdoctors/natural,kjhenner/natural,mamaral/natural,PTaylour/natural,NaturalNode/natural,PMSI-AlignAlytics/natural,ahmedshuhel/natural,moos/natural,polymaths/natural,dpraimeyuu/natural,Logicify/natural,Hugo-ter-Doest/natural,mcanthony/natural,karimsa/natural