require 'spec_helper'

describe Immutable::SortedSet do
  describe '#between' do
    context 'when called without a block' do
      it 'returns a sorted set of all items from the first argument to the second' do
        100.times do
          items   = rand(100).times.collect { rand(1000) }.uniq
          set     = SS.new(items)
          from,to = [rand(1000),rand(1000)].sort
          result  = set.between(from, to)
          array   = items.select { |x| x >= from && x <= to }.sort
          result.class.should be(Immutable::SortedSet)
          result.size.should == array.size
          result.to_a.should == array
        end
      end
    end

    context 'when called with a block' do
      it 'yields all the items lower than the argument' do
        100.times do
          items   = rand(100).times.collect { rand(1000) }.uniq
          set     = SS.new(items)
          from,to = [rand(1000),rand(1000)].sort
          result  = []
          set.between(from, to) { |x| result << x }
          array  = items.select { |x| x >= from && x <= to }.sort
          result.size.should == array.size
          result.should == array
        end
      end
    end

    context 'on an empty set' do
      it 'returns an empty set' do
        SS.empty.between(1, 2).should be_empty
        SS.empty.between('abc', 'def').should be_empty
        SS.empty.between(:symbol, :another).should be_empty
      end
    end

    context "with a 'to' argument lower than the 'from' argument" do
      it 'returns an empty set' do
        result = SS.new(1..100).between(6, 5)
        result.class.should be(Immutable::SortedSet)
        result.should be_empty
      end
    end
  end
end
