ruby--ruby/spec/ruby/shared/enumerator/rewind.rb

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

describe :enum_rewind, shared: true do

  before :each do
    @enum = 1.upto(3)
  end

  it "resets the enumerator to its initial state" do
    @enum.next.should == 1
    @enum.next.should == 2
    @enum.rewind
    @enum.next.should == 1
  end

  it "returns self" do
    @enum.rewind.should == @enum
  end

  it "has no effect on a new enumerator" do
    @enum.rewind
    @enum.next.should == 1
  end

  it "has no effect if called multiple, consecutive times" do
    @enum.next.should == 1
    @enum.rewind
    @enum.rewind
    @enum.next.should == 1
  end

  it "works with peek to reset the position" do
    @enum.next
    @enum.next
    @enum.rewind
    @enum.next
    @enum.peek.should == 2
  end
end