require 'spec_helper'

describe Immutable::Vector do
  let(:vector) { V[[:a, 3], [:b, 2], [:c, 1]] }

  describe '#assoc' do
    it 'searches for a 2-element array with a given 1st item' do
      vector.assoc(:b).should == [:b, 2]
    end

    it 'returns nil if a matching 1st item is not found' do
      vector.assoc(:d).should be_nil
    end

    it 'uses #== to compare 1st items with provided object' do
      vector.assoc(EqualNotEql.new).should_not be_nil
      vector.assoc(EqlNotEqual.new).should be_nil
    end

    it 'skips elements which are not indexable' do
      V[false, true, nil].assoc(:b).should be_nil
      V[[1,2], nil].assoc(3).should be_nil
    end
  end

  describe '#rassoc' do
    it 'searches for a 2-element array with a given 2nd item' do
      vector.rassoc(1).should == [:c, 1]
    end

    it 'returns nil if a matching 2nd item is not found' do
      vector.rassoc(4).should be_nil
    end

    it 'uses #== to compare 2nd items with provided object' do
      vector.rassoc(EqualNotEql.new).should_not be_nil
      vector.rassoc(EqlNotEqual.new).should be_nil
    end

    it 'skips elements which are not indexable' do
      V[false, true, nil].rassoc(:b).should be_nil
      V[[1,2], nil].rassoc(3).should be_nil
    end
  end
end
