You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: formula_installer_spec.rb
    path of file: ./repos/brew/Library/Homebrew/test
    
    the code of the file until where you have to start completion: require "formula"
require "formula_installer"
require "keg"
require "tab"
require "test/support/fixtures/testball"
require "test/support/fixtures/testball_bottle"
require "test/support/fixtures/failball"

describe 
    
  def temporary_install(formula)
    expect(formula).not_to be_installed

    installer = described_class.new(formula)

    installer.install

    keg = Keg.new(formula.prefix)

    expect(formula).to be_installed

    begin
      Tab.clear_cache
      expect(Tab.for_keg(keg)).not_to be_poured_from_bottle

      yield formula if block_given?
    ensure
      Tab.clear_cache
      keg.unlink
      keg.uninstall
      formula.clear_cache
      # there will be log files when sandbox is enable.
      formula.logs.rmtree if formula.logs.directory?
    end