require 'spec_helper'

describe Immutable::Set do
  describe '#none?' do
    context 'when empty' do
      it 'with a block returns true' do
        S.empty.none? {}.should == true
      end

      it 'with no block returns true' do
        S.empty.none?.should == true
      end
    end

    context 'when not empty' do
      context 'with a block' do
        let(:set) { S['A', 'B', 'C', nil] }

        ['A', 'B', 'C', nil].each do |value|
          it "returns false if the block ever returns true (#{value.inspect})" do
            set.none? { |item| item == value }.should == false
          end
        end

        it 'returns true if the block always returns false' do
          set.none? { |item| item == 'D' }.should == true
        end

        it 'stops iterating as soon as the block returns true' do
          yielded = []
          set.none? { |item| yielded << item; true }
          yielded.size.should == 1
        end
      end

      context 'with no block' do
        it 'returns false if any value is truthy' do
          S[nil, false, true, 'A'].none?.should == false
        end

        it 'returns true if all values are falsey' do
          S[nil, false].none?.should == true
        end
      end
    end
  end
end
