require 'spec_helper'

describe Immutable::Vector do
  describe '#compact' do
    it 'returns a new Vector with all nils removed' do
      V[1, nil, 2, nil].compact.should eql(V[1, 2])
      V[1, 2, 3].compact.should eql(V[1, 2, 3])
      V[nil].compact.should eql(V.empty)
    end

    context 'on an empty vector' do
      it 'returns self' do
        V.empty.compact.should be(V.empty)
      end
    end

    it "doesn't remove false" do
      V[false].compact.should eql(V[false])
    end

    context 'from a subclass' do
      it 'returns an instance of the subclass' do
        subclass = Class.new(V)
        instance = subclass[1, nil, 2]
        instance.compact.class.should be(subclass)
      end
    end
  end
end
