test(multicast): add tests related to switchMap
test(multicast): add tests related to switchMap

Add a few more tests for the multicast() operator, related to the switching behavior of switchMap.

Related to bug #1063.

trxcllnt/RxJS,gluck/RxJS,elliotschi/rxjs,RxJS-CN/RxJS-Docs-CN,trxcllnt/RxJS,Igorbek/rxjs5,martinsik/rxjs,Brocco/RxJS,RxJS-CN/RxJS-Docs-CN,saneyuki/RxJS,robwormald/RxJS,adrianomelo/RxJSNext,elliotschi/rxjs,ReactiveX/RxJS,elliotschi/rxjs,elliotschi/rxjs,jayphelps/rxjs,jayphelps/rxjs,ReactiveX/rxjs,staltz/RxJSNext,jayphelps/rxjs,kwonoj/RxJS,jadbox/RxJS,Brocco/RxJS,saneyuki/RxJS,trxcllnt/RxJS,kwonoj/RxJS,staltz/RxJSNext,kwonoj/RxJS,adrianomelo/RxJSNext,martinsik/rxjs,robwormald/RxJS,robwormald/RxJS,jinroh/RxJS,jadbox/RxJS,benlesh/RxJS,SangKa/RxJS-Docs-CN,jadbox/RxJS,jinroh/RxJS,jadbox/RxJS,trxcllnt/RxJS,benlesh/RxJS,benlesh/RxJS,RxJS-CN/RxJS-Docs-CN,figueredo/RxJS,ReactiveX/rxjs,ReactiveX/RxJS,kwonoj/RxJS,ReactiveX/rxjs,robwormald/RxJS,figueredo/RxJS,ReactiveX/rxjs,adrianomelo/RxJS-1,jinroh/RxJS,gluck/RxJS,Igorbek/rxjs5,figueredo/RxJS,gluck/RxJS,IgorMinar/RxJS,adrianomelo/RxJSNext,jayphelps/rxjs,martinsik/rxjs,jayphelps/rxjs,adrianomelo/RxJS-1,Igorbek/rxjs5,adrianomelo/RxJS-1,gluck/RxJS,Igorbek/rxjs5,ReactiveX/RxJS,Brocco/RxJS,adrianomelo/RxJS-1,Brocco/RxJS,figueredo/RxJS,ReactiveX/RxJS,SangKa/RxJS-Docs-CN,RxJS-CN/RxJS-Docs-CN,staltz/RxJSNext,adrianomelo/RxJSNext,jinroh/RxJS,benlesh/RxJS,SangKa/RxJS-Docs-CN,staltz/RxJSNext,martinsik/rxjs,IgorMinar/RxJS,SangKa/RxJS-Docs-CN