Cleanup tests and add a `_.callback` test for `argCount`.
Cleanup tests and add a `_.callback` test for `argCount`.

ajefremovs/lodash,zhangguangyong/lodash,r14r/fork_javascript_lodash,naoina/lodash,BernhardRode/lodash,af7/lodash,polarbird/lodash,boneskull/lodash,greyhwndz/lodash,prawnsalad/lodash,steelsojka/lodash,Droogans/lodash,nbellowe/lodash,enng0227/lodash,developer-prosenjit/lodash,schnerd/lodash,MaxPRafferty/lodash,krahman/lodash,mshoaibraja/lodash,imjerrybao/lodash,zestia/lodash,youprofit/lodash,bnicart/lodash,krahman/lodash,tgriesser/lodash,andersonaguiar/lodash,bnicart/lodash,shwaydogg/lodash,IveWong/lodash,transGLUKator/lodash,chrootsu/lodash,therebelbeta/lodash,xiwc/lodash,jzning-martian/lodash,tejokumar/lodash,BernhardRode/lodash,schnerd/lodash,Lottid/lodash,transGLUKator/lodash,shwaydogg/lodash,samuelbeek/lodash,xixilive/lodash,jshanson7/lodash,gdi2290/lodash,gutenye/lodash,therebelbeta/lodash,Xotic750/lodash,PhiLhoSoft/lodash,jasnell/lodash,Jaspersoft/lodash,zestia/lodash,zhangguangyong/lodash,polarbird/lodash,naoina/lodash,samuelbeek/lodash,mjosh954/lodash,therebelbeta/lodash,ajefremovs/lodash,Xotic750/lodash,lekoaf/lodash,woldie/lodash,felixshu/lodash,PhiLhoSoft/lodash,felixshu/lodash,Droogans/lodash,Jaspersoft/lodash,mjosh954/lodash,studiowangfei/lodash,phillipalexander/lodash,youprofit/lodash,xiwc/lodash,youprofit/lodash,jshanson7/lodash,BernhardRode/lodash,rlugojr/lodash,nbellowe/lodash,MaxPRafferty/lodash,tgriesser/lodash,studiowangfei/lodash,justintung/lodash,dgoncalves1/lodash,imjerrybao/lodash,AneesMohammed/lodash,transGLUKator/lodash,tquetano-r7/lodash,bnicart/lodash,leolin1229/lodash,timruffles/lodash,boneskull/lodash,benweet/lodash,r14r/fork_javascript_lodash,lzheng571/lodash,xixilive/lodash,krrg/lodash,Andrey-Pavlov/lodash,ror/lodash,nsamarcos/lodash,jzning-martian/lodash,schnerd/lodash,huyinghuan/lodash,hafeez-syed/lodash,jacwright/lodash,Lottid/lodash,jacwright/lodash,zestia/lodash,AndBicScadMedia/lodash,gutenye/lodash,joshuaprior/lodash,rtorr/lodash,af7/lodash,reggi/lodash,MaxPRafferty/lodash,prawnsalad/lodash,neouser99/lodash,dgoncalves1/lodash,lekkas/lodash,rtorr/lodash,felixshu/lodash,Andrey-Pavlov/lodash,codydaig/lodash,Moykn/lodash,krahman/lodash,xiwc/lodash,tgriesser/lodash,hafeez-syed/lodash,lzheng571/lodash,woldie/lodash,benweet/lodash,lzheng571/lodash,julianocomg/lodash,ricardohbin/lodash,r14r-work/fork_javascript_lodash,lekkas/lodash,Moykn/lodash,lekoaf/lodash,hitesh97/lodash,leolin1229/lodash,AndBicScadMedia/lodash,ror/lodash,polarbird/lodash,imjerrybao/lodash,leolin1229/lodash,hitesh97/lodash,reggi/lodash,mshoaibraja/lodash,tejokumar/lodash,samuelbeek/lodash,gdi2290/lodash,andersonaguiar/lodash,Droogans/lodash,chrootsu/lodash,IveWong/lodash,justintung/lodash,stewx/lodash,IveWong/lodash,tejokumar/lodash,Andrey-Pavlov/lodash,greyhwndz/lodash,developer-prosenjit/lodash,AndBicScadMedia/lodash,r14r-work/fork_javascript_lodash,Xotic750/lodash,neouser99/lodash,af7/lodash,gutenye/lodash,PhiLhoSoft/lodash,nsamarcos/lodash,joshuaprior/lodash,jzning-martian/lodash,joshuaprior/lodash,dgoncalves1/lodash,jshanson7/lodash,tonyonodi/lodash,phillipalexander/lodash,nsamarcos/lodash,shwaydogg/lodash,greyhwndz/lodash,ror/lodash,beaugunderson/lodash,huyinghuan/lodash,stewx/lodash,msmorgan/lodash,stewx/lodash,julianocomg/lodash,reggi/lodash,justintung/lodash,jasnell/lodash,julianocomg/lodash,AneesMohammed/lodash,hafeez-syed/lodash,neouser99/lodash,javiosyc/lodash,mshoaibraja/lodash,krrg/lodash,r14r-work/fork_javascript_lodash,lekkas/lodash,beaugunderson/lodash,krrg/lodash,studiowangfei/lodash,steelsojka/lodash,enng0227/lodash,mjosh954/lodash,developer-prosenjit/lodash,woldie/lodash,enng0227/lodash,msmorgan/lodash,benweet/lodash,tquetano-r7/lodash,naoina/lodash,timruffles/lodash,xixilive/lodash,ricardohbin/lodash,tonyonodi/lodash,jacwright/lodash,jasnell/lodash,Moykn/lodash,prawnsalad/lodash,rtorr/lodash,javiosyc/lodash,codydaig/lodash,nbellowe/lodash,huyinghuan/lodash,hitesh97/lodash,andersonaguiar/lodash,zhangguangyong/lodash,Jaspersoft/lodash,timruffles/lodash,chrootsu/lodash,ajefremovs/lodash,phillipalexander/lodash,tquetano-r7/lodash,codydaig/lodash,AneesMohammed/lodash,javiosyc/lodash,ricardohbin/lodash,rlugojr/lodash,Lottid/lodash,lekoaf/lodash,r14r/fork_javascript_lodash