Fix unused variable warning
Fix unused variable warning

We need to call `in_time_zone` to test that it isn't modifying the receiver
but since the variable isn't used it raises a warning so add an assertion
to make Ruby think it's being used.

yasslab/railsguides.jp,yhirano55/rails,deraru/rails,betesh/rails,gcourtemanche/rails,Spin42/rails,tgxworld/rails,hanystudy/rails,tjschuck/rails,lcreid/rails,rossta/rails,coreyward/rails,gavingmiller/rails,lucasmazza/rails,illacceptanything/illacceptanything,gavingmiller/rails,kachick/rails,EmmaB/rails-1,ttanimichi/rails,illacceptanything/illacceptanything,iainbeeston/rails,sergey-alekseev/rails,schuetzm/rails,schuetzm/rails,arunagw/rails,notapatch/rails,arunagw/rails,mohitnatoo/rails,joonyou/rails,deraru/rails,bradleypriest/rails,gfvcastro/rails,arjes/rails,mtsmfm/railstest,fabianoleittes/rails,pvalena/rails,vipulnsward/rails,yahonda/rails,richseviora/rails,ttanimichi/rails,rails/rails,Erol/rails,iainbeeston/rails,tjschuck/rails,pvalena/rails,mechanicles/rails,printercu/rails,Erol/rails,Stellenticket/rails,tijwelch/rails,yawboakye/rails,mijoharas/rails,iainbeeston/rails,Vasfed/rails,amoody2108/TechForJustice,voray/rails,rafaelfranca/omg-rails,joonyou/rails,baerjam/rails,matrinox/rails,utilum/rails,vipulnsward/rails,repinel/rails,mtsmfm/rails,illacceptanything/illacceptanything,palkan/rails,repinel/rails,flanger001/rails,illacceptanything/illacceptanything,starknx/rails,yalab/rails,rbhitchcock/rails,illacceptanything/illacceptanything,sealocal/rails,yahonda/rails,shioyama/rails,mtsmfm/rails,schuetzm/rails,kmcphillips/rails,samphilipd/rails,bogdanvlviv/rails,lcreid/rails,ngpestelos/rails,BlakeWilliams/rails,mathieujobin/reduced-rails-for-travis,Edouard-chin/rails,kenta-s/rails,mtsmfm/railstest,iainbeeston/rails,notapatch/rails,lcreid/rails,jeremy/rails,yawboakye/rails,amoody2108/TechForJustice,gfvcastro/rails,Vasfed/rails,bradleypriest/rails,88rabbit/newRails,BlakeWilliams/rails,shioyama/rails,bradleypriest/rails,tijwelch/rails,brchristian/rails,hanystudy/rails,yasslab/railsguides.jp,Sen-Zhang/rails,yalab/rails,lucasmazza/rails,kddeisz/rails,mijoharas/rails,eileencodes/rails,shioyama/rails,kmcphillips/rails,printercu/rails,kddeisz/rails,illacceptanything/illacceptanything,travisofthenorth/rails,kenta-s/rails,bolek/rails,utilum/rails,kddeisz/rails,fabianoleittes/rails,yasslab/railsguides.jp,koic/rails,odedniv/rails,eileencodes/rails,fabianoleittes/rails,kirs/rails-1,pvalena/rails,richseviora/rails,riseshia/railsguides.kr,ngpestelos/rails,vassilevsky/rails,Spin42/rails,amoody2108/TechForJustice,alecspopa/rails,assain/rails,arunagw/rails,ttanimichi/rails,betesh/rails,BlakeWilliams/rails,arjes/rails,rails/rails,gcourtemanche/rails,assain/rails,gfvcastro/rails,voray/rails,pschambacher/rails,bogdanvlviv/rails,notapatch/rails,yalab/rails,vipulnsward/rails,Spin42/rails,marklocklear/rails,EmmaB/rails-1,MichaelSp/rails,deraru/rails,kamipo/rails,coreyward/rails,Sen-Zhang/rails,felipecvo/rails,bolek/rails,jeremy/rails,utilum/rails,mijoharas/rails,sealocal/rails,travisofthenorth/rails,felipecvo/rails,MSP-Greg/rails,vipulnsward/rails,jeremy/rails,MSP-Greg/rails,rafaelfranca/omg-rails,brchristian/rails,untidy-hair/rails,georgeclaghorn/rails,EmmaB/rails-1,mtsmfm/railstest,illacceptanything/illacceptanything,mathieujobin/reduced-rails-for-travis,alecspopa/rails,Sen-Zhang/rails,elfassy/rails,kirs/rails-1,koic/rails,assain/rails,Envek/rails,palkan/rails,maicher/rails,kachick/rails,illacceptanything/illacceptanything,Edouard-chin/rails,mechanicles/rails,aditya-kapoor/rails,kamipo/rails,yawboakye/rails,flanger001/rails,matrinox/rails,rafaelfranca/omg-rails,mohitnatoo/rails,gcourtemanche/rails,koic/rails,eileencodes/rails,yahonda/rails,prathamesh-sonpatki/rails,vassilevsky/rails,gfvcastro/rails,Erol/rails,MSP-Greg/rails,kmayer/rails,untidy-hair/rails,illacceptanything/illacceptanything,ledestin/rails,stefanmb/rails,voray/rails,yalab/rails,samphilipd/rails,kaspth/rails,rossta/rails,joonyou/rails,Stellenticket/rails,riseshia/railsguides.kr,matrinox/rails,esparta/rails,richseviora/rails,deraru/rails,ngpestelos/rails,georgeclaghorn/rails,Vasfed/rails,utilum/rails,Envek/rails,BlakeWilliams/rails,yahonda/rails,elfassy/rails,kachick/rails,starknx/rails,bogdanvlviv/rails,mechanicles/rails,aditya-kapoor/rails,lcreid/rails,illacceptanything/illacceptanything,mohitnatoo/rails,Erol/rails,yhirano55/rails,esparta/rails,eileencodes/rails,printercu/rails,prathamesh-sonpatki/rails,sealocal/rails,lucasmazza/rails,kenta-s/rails,mechanicles/rails,travisofthenorth/rails,tjschuck/rails,odedniv/rails,xlymian/rails,kaspth/rails,betesh/rails,arunagw/rails,marklocklear/rails,Envek/rails,kmayer/rails,yasslab/railsguides.jp,elfassy/rails,notapatch/rails,vassilevsky/rails,aditya-kapoor/rails,MichaelSp/rails,palkan/rails,tjschuck/rails,jeremy/rails,kamipo/rails,esparta/rails,stefanmb/rails,ledestin/rails,kirs/rails-1,tgxworld/rails,schuetzm/rails,Envek/rails,gauravtiwari/rails,maicher/rails,mohitnatoo/rails,MichaelSp/rails,travisofthenorth/rails,illacceptanything/illacceptanything,ledestin/rails,stefanmb/rails,coreyward/rails,xlymian/rails,Stellenticket/rails,bolek/rails,Vasfed/rails,kmcphillips/rails,assain/rails,sergey-alekseev/rails,esparta/rails,yawboakye/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