added tests for remove, list and walk methods.
added tests for remove, list and walk methods.

dartajax/ilios,justinchu17/ilios,thecoolestguy/ilios,Trott/ilios,stopfstedt/ilios,ilios/ilios,stopfstedt/ilios,thecoolestguy/ilios,justinchu17/ilios,justinchu17/ilios,dartajax/ilios,justinchu17/ilios,ilios/ilios,Trott/ilios