[tests] Add some quick new String index testing
[tests] Add some quick new String index testing

sschiau/swift,amraboelela/swift,natecook1000/swift,gribozavr/swift,jckarter/swift,sschiau/swift,harlanhaskins/swift,shahmishal/swift,lorentey/swift,parkera/swift,austinzheng/swift,huonw/swift,aschwaighofer/swift,glessard/swift,gregomni/swift,hooman/swift,hooman/swift,glessard/swift,roambotics/swift,gribozavr/swift,gribozavr/swift,aschwaighofer/swift,glessard/swift,allevato/swift,apple/swift,nathawes/swift,sschiau/swift,roambotics/swift,airspeedswift/swift,danielmartin/swift,glessard/swift,xwu/swift,shajrawi/swift,sschiau/swift,lorentey/swift,natecook1000/swift,nathawes/swift,atrick/swift,shajrawi/swift,practicalswift/swift,gregomni/swift,karwa/swift,rudkx/swift,devincoughlin/swift,huonw/swift,karwa/swift,sschiau/swift,rudkx/swift,amraboelela/swift,tkremenek/swift,tkremenek/swift,apple/swift,austinzheng/swift,atrick/swift,atrick/swift,roambotics/swift,harlanhaskins/swift,devincoughlin/swift,karwa/swift,gribozavr/swift,aschwaighofer/swift,huonw/swift,apple/swift,practicalswift/swift,airspeedswift/swift,practicalswift/swift,tkremenek/swift,devincoughlin/swift,benlangmuir/swift,karwa/swift,danielmartin/swift,xedin/swift,alblue/swift,lorentey/swift,practicalswift/swift,sschiau/swift,JGiola/swift,shahmishal/swift,parkera/swift,atrick/swift,aschwaighofer/swift,JGiola/swift,gregomni/swift,benlangmuir/swift,allevato/swift,rudkx/swift,ahoppen/swift,brentdax/swift,xwu/swift,nathawes/swift,rudkx/swift,practicalswift/swift,practicalswift/swift,devincoughlin/swift,hooman/swift,devincoughlin/swift,gregomni/swift,nathawes/swift,xwu/swift,xwu/swift,austinzheng/swift,huonw/swift,parkera/swift,stephentyrone/swift,shajrawi/swift,rudkx/swift,roambotics/swift,benlangmuir/swift,airspeedswift/swift,austinzheng/swift,xedin/swift,alblue/swift,natecook1000/swift,lorentey/swift,hooman/swift,danielmartin/swift,huonw/swift,allevato/swift,airspeedswift/swift,ahoppen/swift,jmgc/swift,nathawes/swift,sschiau/swift,lorentey/swift,jckarter/swift,lorentey/swift,glessard/swift,xedin/swift,lorentey/swift,airspeedswift/swift,brentdax/swift,danielmartin/swift,shajrawi/swift,tkremenek/swift,danielmartin/swift,huonw/swift,alblue/swift,stephentyrone/swift,xwu/swift,xedin/swift,CodaFi/swift,CodaFi/swift,atrick/swift,jmgc/swift,tkremenek/swift,CodaFi/swift,harlanhaskins/swift,JGiola/swift,roambotics/swift,stephentyrone/swift,stephentyrone/swift,airspeedswift/swift,jopamer/swift,aschwaighofer/swift,jopamer/swift,gregomni/swift,sschiau/swift,xedin/swift,amraboelela/swift,xedin/swift,jmgc/swift,nathawes/swift,hooman/swift,parkera/swift,parkera/swift,ahoppen/swift,glessard/swift,xwu/swift,shahmishal/swift,apple/swift,parkera/swift,CodaFi/swift,shahmishal/swift,alblue/swift,jopamer/swift,jckarter/swift,huonw/swift,shajrawi/swift,alblue/swift,lorentey/swift,CodaFi/swift,JGiola/swift,benlangmuir/swift,harlanhaskins/swift,nathawes/swift,benlangmuir/swift,JGiola/swift,gregomni/swift,shajrawi/swift,jopamer/swift,parkera/swift,natecook1000/swift,xedin/swift,karwa/swift,hooman/swift,gribozavr/swift,jopamer/swift,ahoppen/swift,apple/swift,jckarter/swift,harlanhaskins/swift,shahmishal/swift,ahoppen/swift,amraboelela/swift,brentdax/swift,karwa/swift,atrick/swift,shajrawi/swift,amraboelela/swift,devincoughlin/swift,stephentyrone/swift,rudkx/swift,allevato/swift,danielmartin/swift,apple/swift,karwa/swift,jmgc/swift,natecook1000/swift,harlanhaskins/swift,brentdax/swift,gribozavr/swift,jckarter/swift,shahmishal/swift,devincoughlin/swift,shahmishal/swift,danielmartin/swift,allevato/swift,karwa/swift,devincoughlin/swift,austinzheng/swift,jopamer/swift,stephentyrone/swift,tkremenek/swift,austinzheng/swift,shahmishal/swift,benlangmuir/swift,jmgc/swift,austinzheng/swift,jmgc/swift,allevato/swift,xedin/swift,gribozavr/swift,jckarter/swift,jckarter/swift,natecook1000/swift,jmgc/swift,JGiola/swift,amraboelela/swift,roambotics/swift,practicalswift/swift,xwu/swift,allevato/swift,gribozavr/swift,harlanhaskins/swift,brentdax/swift,brentdax/swift,alblue/swift,amraboelela/swift,practicalswift/swift,CodaFi/swift,airspeedswift/swift,alblue/swift,brentdax/swift,CodaFi/swift,jopamer/swift,shajrawi/swift,aschwaighofer/swift,hooman/swift,natecook1000/swift,ahoppen/swift,tkremenek/swift,stephentyrone/swift,aschwaighofer/swift,parkera/swift