require 'spec_helper'

describe Immutable::Vector do
  describe '#take_while' do
    [
      [[], []],
      [['A'], ['A']],
      [%w[A B C], %w[A B]]
    ].each do |values, expected|
      describe "on #{values.inspect}" do
        let(:vector) { V[*values] }
        let(:result) { vector.take_while { |item| item < 'C' }}

        describe 'with a block' do
          it "returns #{expected.inspect}" do
            result.should eql(V[*expected])
          end

          it 'preserves the original' do
            result
            vector.should eql(V[*values])
          end
        end

        describe 'without a block' do
          it 'returns an Enumerator' do
            vector.take_while.class.should be(Enumerator)
            vector.take_while.each { |item| item < 'C' }.should eql(V[*expected])
          end
        end
      end
    end
  end
end