shift_spec.rb

require File.expand_path('../../../../spec_helper', __FILE__)

process_is_foreground do
  with_feature :readline do
    require 'readline'

    describe "Readline::HISTORY.shift" do
      it "returns nil when the history is empty" do
        Readline::HISTORY.shift.should be_nil
      end

      it "returns and removes the first item from the history" do
        Readline::HISTORY.push("1", "2", "3")
        Readline::HISTORY.size.should == 3

        Readline::HISTORY.shift.should == "1"
        Readline::HISTORY.size.should == 2

        Readline::HISTORY.shift.should == "2"
        Readline::HISTORY.size.should == 1

        Readline::HISTORY.shift.should == "3"
        Readline::HISTORY.size.should == 0
      end

      it "taints the returned strings" do
        Readline::HISTORY.push("1", "2", "3")
        Readline::HISTORY.shift.tainted?.should be_true
        Readline::HISTORY.shift.tainted?.should be_true
        Readline::HISTORY.shift.tainted?.should be_true
      end
    end
  end
end