Test collection caching with callable cache key.
Test collection caching with callable cache key.

When people pass `cache: -> item { item.upcase }` they scope the collection
cache keys so the individual partial cache isn't reused.

Test that behavior.

utilum/rails,gfvcastro/rails,yalab/rails,fabianoleittes/rails,ledestin/rails,kddeisz/rails,Edouard-chin/rails,arunagw/rails,stefanmb/rails,bradleypriest/rails,Envek/rails,deraru/rails,yhirano55/rails,kamipo/rails,bogdanvlviv/rails,mijoharas/rails,coreyward/rails,deraru/rails,iainbeeston/rails,gauravtiwari/rails,rails/rails,brchristian/rails,palkan/rails,odedniv/rails,printercu/rails,lcreid/rails,eileencodes/rails,ttanimichi/rails,ttanimichi/rails,pvalena/rails,illacceptanything/illacceptanything,georgeclaghorn/rails,fabianoleittes/rails,travisofthenorth/rails,Edouard-chin/rails,kamipo/rails,richseviora/rails,amoody2108/TechForJustice,flanger001/rails,deraru/rails,voray/rails,mathieujobin/reduced-rails-for-travis,voray/rails,yawboakye/rails,betesh/rails,yhirano55/rails,schuetzm/rails,felipecvo/rails,Stellenticket/rails,BlakeWilliams/rails,illacceptanything/illacceptanything,assain/rails,marklocklear/rails,lucasmazza/rails,yawboakye/rails,utilum/rails,yhirano55/rails,kachick/rails,mohitnatoo/rails,Edouard-chin/rails,travisofthenorth/rails,Vasfed/rails,sergey-alekseev/rails,rbhitchcock/rails,rails/rails,mijoharas/rails,untidy-hair/rails,mohitnatoo/rails,palkan/rails,MSP-Greg/rails,kddeisz/rails,sergey-alekseev/rails,kmcphillips/rails,illacceptanything/illacceptanything,mohitnatoo/rails,yalab/rails,illacceptanything/illacceptanything,bradleypriest/rails,riseshia/railsguides.kr,printercu/rails,vipulnsward/rails,gcourtemanche/rails,ledestin/rails,samphilipd/rails,repinel/rails,mtsmfm/railstest,gavingmiller/rails,yahonda/rails,notapatch/rails,kirs/rails-1,brchristian/rails,bogdanvlviv/rails,MichaelSp/rails,schuetzm/rails,rbhitchcock/rails,riseshia/railsguides.kr,Stellenticket/rails,tjschuck/rails,tijwelch/rails,MichaelSp/rails,vipulnsward/rails,yhirano55/rails,vassilevsky/rails,aditya-kapoor/rails,kddeisz/rails,Erol/rails,rbhitchcock/rails,rossta/rails,odedniv/rails,ttanimichi/rails,illacceptanything/illacceptanything,assain/rails,assain/rails,tijwelch/rails,ngpestelos/rails,mtsmfm/railstest,yasslab/railsguides.jp,coreyward/rails,mechanicles/rails,kachick/rails,rafaelfranca/omg-rails,maicher/rails,yahonda/rails,kmcphillips/rails,Spin42/rails,untidy-hair/rails,hanystudy/rails,mechanicles/rails,elfassy/rails,matrinox/rails,schuetzm/rails,richseviora/rails,bradleypriest/rails,illacceptanything/illacceptanything,schuetzm/rails,marklocklear/rails,repinel/rails,palkan/rails,felipecvo/rails,vassilevsky/rails,esparta/rails,mtsmfm/rails,MSP-Greg/rails,starknx/rails,jeremy/rails,lcreid/rails,flanger001/rails,printercu/rails,shioyama/rails,joonyou/rails,prathamesh-sonpatki/rails,pvalena/rails,rafaelfranca/omg-rails,prathamesh-sonpatki/rails,eileencodes/rails,vipulnsward/rails,jeremy/rails,rails/rails,shioyama/rails,yasslab/railsguides.jp,illacceptanything/illacceptanything,koic/rails,baerjam/rails,mijoharas/rails,travisofthenorth/rails,esparta/rails,aditya-kapoor/rails,pschambacher/rails,rafaelfranca/omg-rails,yasslab/railsguides.jp,tjschuck/rails,illacceptanything/illacceptanything,bolek/rails,esparta/rails,tgxworld/rails,matrinox/rails,utilum/rails,alecspopa/rails,elfassy/rails,samphilipd/rails,tgxworld/rails,prathamesh-sonpatki/rails,kaspth/rails,baerjam/rails,bolek/rails,jeremy/rails,xlymian/rails,EmmaB/rails-1,Spin42/rails,shioyama/rails,betesh/rails,illacceptanything/illacceptanything,gcourtemanche/rails,Erol/rails,Envek/rails,hanystudy/rails,mechanicles/rails,flanger001/rails,riseshia/railsguides.kr,alecspopa/rails,kmcphillips/rails,amoody2108/TechForJustice,Spin42/rails,ngpestelos/rails,Edouard-chin/rails,aditya-kapoor/rails,mechanicles/rails,utilum/rails,baerjam/rails,mtsmfm/railstest,rossta/rails,kmcphillips/rails,maicher/rails,Stellenticket/rails,tjschuck/rails,hanystudy/rails,brchristian/rails,sealocal/rails,kachick/rails,deraru/rails,arjes/rails,odedniv/rails,tijwelch/rails,coreyward/rails,marklocklear/rails,palkan/rails,gcourtemanche/rails,tgxworld/rails,koic/rails,alecspopa/rails,kaspth/rails,esparta/rails,illacceptanything/illacceptanything,gauravtiwari/rails,starknx/rails,notapatch/rails,travisofthenorth/rails,vipulnsward/rails,aditya-kapoor/rails,shioyama/rails,joonyou/rails,sergey-alekseev/rails,pschambacher/rails,kenta-s/rails,ledestin/rails,gavingmiller/rails,illacceptanything/illacceptanything,lucasmazza/rails,repinel/rails,yawboakye/rails,yahonda/rails,matrinox/rails,kmayer/rails,joonyou/rails,iainbeeston/rails,eileencodes/rails,Erol/rails,felipecvo/rails,lucasmazza/rails,EmmaB/rails-1,arjes/rails,kmayer/rails,gavingmiller/rails,jeremy/rails,arunagw/rails,notapatch/rails,xlymian/rails,ngpestelos/rails,joonyou/rails,tgxworld/rails,printercu/rails,starknx/rails,georgeclaghorn/rails,stefanmb/rails,rossta/rails,Vasfed/rails,baerjam/rails,yasslab/railsguides.jp,yalab/rails,MSP-Greg/rails,samphilipd/rails,Envek/rails,EmmaB/rails-1,pvalena/rails,untidy-hair/rails,pschambacher/rails,elfassy/rails,voray/rails,Stellenticket/rails,mathieujobin/reduced-rails-for-travis,kddeisz/rails,iainbeeston/rails,arjes/rails,xlymian/rails,Sen-Zhang/rails,bogdanvlviv/rails,yahonda/rails,illacceptanything/illacceptanything,kmayer/rails,bolek/rails,mohitnatoo/rails,vassilevsky/rails,prathamesh-sonpatki/rails,Erol/rails,iainbeeston/rails,Vasfed/rails,kenta-s/rails,eileencodes/rails,kirs/rails-1,sealocal/rails,maicher/rails,yalab/rails,kirs/rails-1,illacceptanything/illacceptanything,kenta-s/rails,repinel/rails,untidy-hair/rails,MSP-Greg/rails,BlakeWilliams/rails,gfvcastro/rails,Sen-Zhang/rails,arunagw/rails,mtsmfm/rails,BlakeWilliams/rails,Vasfed/rails,lcreid/rails,gfvcastro/rails,amoody2108/TechForJustice,illacceptanything/illacceptanything,gfvcastro/rails,richseviora/rails,mtsmfm/rails,bogdanvlviv/rails,rails/rails,koic/rails,stefanmb/rails,fabianoleittes/rails,betesh/rails,tjschuck/rails,arunagw/rails,kaspth/rails,yawboakye/rails,riseshia/railsguides.kr,georgeclaghorn/rails,mathieujobin/reduced-rails-for-travis,BlakeWilliams/rails,fabianoleittes/rails,pvalena/rails,sealocal/rails,Sen-Zhang/rails,Envek/rails,notapatch/rails,lcreid/rails,betesh/rails,kamipo/rails,flanger001/rails,assain/rails,MichaelSp/rails,illacceptanything/illacceptanything,georgeclaghorn/rails,gauravtiwari/rails