require 'spec_helper'

describe Immutable::List do
  describe '#count' do
    context 'on a really big list' do
      it "doesn't run out of stack" do
        -> { BigList.count }.should_not raise_error
      end
    end

    [
      [[], 0],
      [[1], 1],
      [[1, 2], 1],
      [[1, 2, 3], 2],
      [[1, 2, 3, 4], 2],
      [[1, 2, 3, 4, 5], 3],
    ].each do |values, expected|
      context "on #{values.inspect}" do
        let(:list) { L[*values] }

        context 'with a block' do
          it "returns #{expected.inspect}" do
            list.count(&:odd?).should == expected
          end
        end

        context 'without a block' do
          it 'returns length' do
            list.count.should == list.length
          end
        end
      end
    end
  end
end
