Add broken test, revealing test helper flaw
Add broken test, revealing test helper flaw

This commit adds a broken test, which is meant to expose a flaw in the
constructor of `Cask::Config`.

That (broken) test still passes because there’s also a flaw in our
test helper code.

The helper flaw happens to neutralize the `Cask::Config` flaw.

sjackman/homebrew,claui/brew,MikeMcQuaid/brew,konqui/brew,claui/brew,mahori/brew,JCount/brew,sjackman/homebrew,EricFromCanada/brew,mahori/brew,nandub/brew,reitermarkus/brew,EricFromCanada/brew,Homebrew/brew,vitorgalvao/brew,JCount/brew,EricFromCanada/brew,Homebrew/brew,JCount/brew,reitermarkus/brew,vitorgalvao/brew,vitorgalvao/brew,reitermarkus/brew,konqui/brew,konqui/brew,konqui/brew,claui/brew,nandub/brew,MikeMcQuaid/brew,mahori/brew,MikeMcQuaid/brew,nandub/brew,sjackman/homebrew,EricFromCanada/brew,claui/brew,nandub/brew,reitermarkus/brew,MikeMcQuaid/brew,JCount/brew,vitorgalvao/brew,Homebrew/brew,mahori/brew,Homebrew/brew,sjackman/homebrew