new_tests.rb

describe "#users", fakefs: true do
  def stub_etc_passwd
    FileUtils.mkdir("/etc")
    File.open("/etc/passwd", "w") do |f|
      f.puts("andy:*:100:100")
      f.puts("bob:*:101:102")
    end
  end

  it "reads /etc/passwd and returns user information" do
    stub_etc_passwd

    users.should == [["andy", "*", "100", "100"],
                     ["bob",  "*", "101", "101"]]
  end
end