require 'spec_helper'

describe Immutable::Hash do
  describe '#each_with_index' do
    let(:hash) { H['A' => 'aye', 'B' => 'bee', 'C' => 'see'] }

    describe 'with a block (internal iteration)' do
      it 'returns self' do
        hash.each_with_index {}.should be(hash)
      end

      it 'yields all key/value pairs with numeric indexes' do
        actual_pairs = {}
        indexes = []
        hash.each_with_index { |(key, value), index| actual_pairs[key] = value; indexes << index }
        actual_pairs.should == { 'A' => 'aye', 'B' => 'bee', 'C' => 'see' }
        indexes.sort.should == [0, 1, 2]
      end
    end

    describe 'with no block' do
      it 'returns an Enumerator' do
        hash.each_with_index.should be_kind_of(Enumerator)
        hash.each_with_index.to_a.map(&:first).sort.should eql([['A', 'aye'], ['B', 'bee'], ['C', 'see']])
        hash.each_with_index.to_a.map(&:last).should eql([0,1,2])
      end
    end
  end
end