fixed inconsistent `require 'test_helper'` in testing guide
fixed inconsistent `require 'test_helper'` in testing guide

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