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path: root/spec/ruby/library/readline/history/shift_spec.rb
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require_relative '../spec_helper'

with_feature :readline do
  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
  end
end