Simplify testChoExternal by introducing a roundtrip/2 function
Simplify testChoExternal by introducing a roundtrip/2 function

krishnakumar4a4/otp,schlagert/otp,kvakvs/otp,NOMORECOFFEE/otp,weisslj/otp,electricimp/otp,uabboli/otp,RJ/otp,jemsbhai/otp,ahmedshafeeq/otp,beni55/otp,yangchengjian/otp,RJ/otp,sammoth-wazoku/otp,derek121/otp,emile/otp,aboroska/otp,sdebnath/otp,lianghaivv/otp,getong/otp,RJ/otp,entropiae/otp,saleyn/otp,lhslll/otp,paladim/otp,tuncer/otp,yangchengjian/otp,legoscia/otp,falkevik/otp,neeraj9/otp,bsmr-erlang/otp,paladim/otp,entropiae/otp,electricimp/otp,paulcager/otp,bugs-erlang-org/otp,release-project/otp,potatosalad/otp,massemanet/otp,vinoski/otp,emacsmirror/erlang,bernardd/otp,GinjaNinja32/otp,basho/otp,lianghaivv/otp,gjaldon/otp,vladdu/otp,lemenkov/otp,mujiatong/otp,saleyn/otp,ferd/otp,neeraj9/otp,jj1bdx/otp,enikki/otp,lightcyphers/otp,vic/otp,tuncer/otp,mujiatong/otp,lemenkov/otp,isvilen/otp,bjorng/otp,uabboli/otp,ferd/otp,mikpe/otp,Teino1978-Corp/otp,vinoski/otp,dgud/otp,RoadRunnr/otp,release-project/otp,lhslll/otp,entropiae/otp,c-rack/otp,msantos/otp,release-project/otp,theom/otp,gjaldon/otp,fenollp/otp,msantos/otp,vic/otp,rlipscombe/otp,cnbin/otp,psyeugenic/otp,RaimoNiskanen/otp,benoitc/otp-1,jinshana/otp,lantti/otp,beni55/otp,isvilen/otp,falkevik/otp,cobusc/otp,bjorng/otp,bjorng/otp,matwey/otp,cnbin/otp,palas/otp,paulcager/otp,RichMorin/otp,getong/otp,massemanet/otp,NOMORECOFFEE/otp,jinshana/otp,massemanet/otp,NOMORECOFFEE/otp,cobusc/otp,RaimoNiskanen/otp,gjaldon/otp,krishnakumar4a4/otp,ader1990/otp,psyeugenic/otp,Teino1978-Corp/erlang-otp,Teino1978-Corp/otp,weisslj/otp,marquisthunder/otp,palas/otp,entropiae/otp,riverrun/otp,uabboli/otp,cnbin/otp,potatosalad/otp,kvakvs/otp,jj1bdx/otp,tuncer/otp,jemsbhai/otp,aboroska/otp,matwey/otp,Teino1978-Corp/otp,bugs-erlang-org/otp,palas/otp,potatosalad/otp,theom/otp,benoitc/otp-1,psyeugenic/otp,vladdu/otp,g-andrade/otp,benoitc/otp-1,awetzel/otp,vinoski/otp,lucafavatella/otp,vinoski/otp,lemenkov/otp,goertzenator/otp,klarna/otp,msantos/otp,derek121/otp,Teino1978-Corp/erlang-otp,jemsbhai/otp,falkevik/otp,ahmedshafeeq/otp,ader1990/otp,derek121/otp,dumbbell/otp,lrascao/otp,enikki/otp,dgud/otp,ahmedshafeeq/otp,marquisthunder/otp,vic/otp,haguenau/otp,basho/otp,vinoski/otp,legoscia/otp,emile/otp,weisslj/otp,bsmr-erlang/otp,lightcyphers/otp,gjaldon/otp,sammoth-wazoku/otp,schlagert/otp,lantti/otp,jj1bdx/otp,paulcager/otp,lightcyphers/otp,fenollp/otp,kvakvs/otp,emile/otp,johanclaesson/otp,neeraj9/otp,johanclaesson/otp,g-andrade/otp,ahmedshafeeq/otp,vic/otp,uabboli/otp,theom/otp,RaimoNiskanen/otp,msantos/otp,sammoth-wazoku/otp,kvakvs/otp,potatosalad/otp,ader1990/otp,jj1bdx/otp,paladim/otp,vladdu/otp,tuncer/otp,jj1bdx/otp,lemenkov/otp,Teino1978-Corp/erlang-otp,emile/otp,stolen/otp,krishnakumar4a4/otp,neeraj9/otp,rlipscombe/otp,gjaldon/otp,johanclaesson/otp,electricimp/otp,dumbbell/otp,jinshana/otp,VincentHHL/otp,platinumthinker/otp,RJ/otp,johanclaesson/otp,cnbin/otp,g-andrade/otp,basho/otp,sdebnath/otp,entropiae/otp,saleyn/otp,RaimoNiskanen/otp,beni55/otp,erlang/otp,erlang/otp,hairyhum/otp,lucafavatella/otp,lucafavatella/otp,haguenau/otp,awetzel/otp,lhslll/otp,sitexa/otp,dumbbell/otp,kvakvs/otp,sdebnath/otp,bernardd/otp,hairyhum/otp,mikpe/otp,saleyn/otp,electricimp/otp,bjorng/otp,krishnakumar4a4/otp,getong/otp,gjaldon/otp,legoscia/otp,stolen/otp,c-rack/otp,derek121/otp,jamesruan/otp,isvilen/otp,basho/otp,falkevik/otp,massemanet/otp,saleyn/otp,uabboli/otp,basho/otp,c-rack/otp,mikpe/otp,uabboli/otp,release-project/otp,krishnakumar4a4/otp,jamesruan/otp,cobusc/otp,RGafiyatullin/otp,platinumthinker/otp,bjorng/otp,GinjaNinja32/otp,bsmr-erlang/otp,mikpe/otp,aboroska/otp,lightcyphers/otp,hairyhum/otp,weisslj/otp,potatosalad/otp,aboroska/otp,vladdu/otp,lightcyphers/otp,aboroska/otp,RoadRunnr/otp,schlagert/otp,bugs-erlang-org/otp,ahmedshafeeq/otp,msantos/otp,Teino1978-Corp/otp,jamesruan/otp,g-andrade/otp,johanclaesson/otp,enikki/otp,haguenau/otp,kvakvs/otp,ahmedshafeeq/otp,lrascao/otp,jamesruan/otp,hairyhum/otp,matwey/otp,ahmedshafeeq/otp,c-rack/otp,tuncer/otp,vinoski/otp,cobusc/otp,schlagert/otp,RoadRunnr/otp,ader1990/otp,sitexa/otp,krishnakumar4a4/otp,RichMorin/otp,rlipscombe/otp,sammoth-wazoku/otp,NOMORECOFFEE/otp,paladim/otp,jamesruan/otp,lemenkov/otp,jinshana/otp,lucafavatella/otp,sammoth-wazoku/otp,sdebnath/otp,lucafavatella/otp,kvakvs/otp,RichMorin/otp,getong/otp,weisslj/otp,dgud/otp,lianghaivv/otp,electricimp/otp,bugs-erlang-org/otp,sdebnath/otp,theom/otp,bugs-erlang-org/otp,legoscia/otp,yangchengjian/otp,jamesruan/otp,schlagert/otp,jamesruan/otp,RichMorin/otp,paladim/otp,uabboli/otp,derek121/otp,riverrun/otp,lhslll/otp,derek121/otp,sdebnath/otp,bugs-erlang-org/otp,bjorng/otp,RJ/otp,jemsbhai/otp,RichMorin/otp,potatosalad/otp,isvilen/otp,mujiatong/otp,getong/otp,mikpe/otp,Teino1978-Corp/erlang-otp,theom/otp,tuncer/otp,lrascao/otp,beni55/otp,mikpe/otp,theom/otp,haguenau/otp,basho/otp,sammoth-wazoku/otp,psyeugenic/otp,bsmr-erlang/otp,vinoski/otp,dumbbell/otp,awetzel/otp,lhslll/otp,marquisthunder/otp,lhslll/otp,erlang/otp,bernardd/otp,theom/otp,matwey/otp,electricimp/otp,awetzel/otp,ligh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