added unit tests to cover the Trie updates
added unit tests to cover the Trie updates

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