Add a test for inserting with an existing key
Add a test for inserting with an existing key

asendecka/djangae,jscissr/djangae,stucox/djangae,asendecka/djangae,pablorecio/djangae,armirusco/djangae,grzes/djangae,chargrizzle/djangae,leekchan/djangae,martinogden/djangae,jscissr/djangae,kirberich/djangae,leekchan/djangae,nealedj/djangae,wangjun/djangae,trik/djangae,nealedj/djangae,trik/djangae,martinogden/djangae,chargrizzle/djangae,kirberich/djangae,asendecka/djangae,wangjun/djangae,stucox/djangae,pablorecio/djangae,leekchan/djangae,wangjun/djangae,SiPiggles/djangae,SiPiggles/djangae,armirusco/djangae,armirusco/djangae,pablorecio/djangae,nealedj/djangae,grzes/djangae,stucox/djangae,potatolondon/djangae,grzes/djangae,chargrizzle/djangae,SiPiggles/djangae,b-cannon/my_djae,potatolondon/djangae,trik/djangae,kirberich/djangae,jscissr/djangae,martinogden/djangae