extract: add spec/integration test
extract: add spec/integration test

MikeMcQuaid/brew,Linuxbrew/brew,vitorgalvao/brew,nandub/brew,sjackman/homebrew,nandub/brew,konqui/brew,mahori/brew,Homebrew/brew,konqui/brew,mahori/brew,nandub/brew,reitermarkus/brew,maxim-belkin/brew,sjackman/homebrew,claui/brew,Homebrew/brew,claui/brew,maxim-belkin/brew,claui/brew,sjackman/homebrew,EricFromCanada/brew,reitermarkus/brew,DomT4/brew,vitorgalvao/brew,JCount/brew,Linuxbrew/brew,DomT4/brew,reitermarkus/brew,nandub/brew,JCount/brew,vitorgalvao/brew,JCount/brew,JCount/brew,DomT4/brew,reitermarkus/brew,Homebrew/brew,EricFromCanada/brew,MikeMcQuaid/brew,Linuxbrew/brew,mahori/brew,sjackman/homebrew,Linuxbrew/brew,MikeMcQuaid/brew,mahori/brew,DomT4/brew,MikeMcQuaid/brew,konqui/brew,claui/brew,Homebrew/brew,EricFromCanada/brew,EricFromCanada/brew,maxim-belkin/brew,vitorgalvao/brew,konqui/brew