Fix duration function tests
Fix duration function tests

nagyistoce/TinCanJS,FishHooks/TinCanJS,GrahamGoudeau21/TinCanJS,EdDixon/TinCanJS,RusticiSoftware/TinCanJS,EdDixon/TinCanJS,nagyistoce/TinCanJS,RusticiSoftware/TinCanJS,GrahamGoudeau21/TinCanJS,garemoko/TinCanJS,garemoko/TinCanJS,brianjmiller/TinCanJS,garyfeng/TinCanJS,garyfeng/TinCanJS,FishHooks/TinCanJS,brianjmiller/TinCanJS