require 'spec_helper'

describe Immutable::Set do
  describe '#intersect?' do
    [
      [[], [], false],
      [['A'], [], false],
      [[], ['A'], false],
      [['A'], ['A'], true],
      [%w[A B C], ['B'], true],
      [['B'], %w[A B C], true],
      [%w[A B C], %w[D E], false],
      [%w[F G H I], %w[A B C], false],
      [%w[A B C], %w[A B C], true],
      [%w[A B C], %w[A B C D], true],
      [%w[D E F G], %w[A B C], false],
    ].each do |a, b, expected|
      describe "for #{a.inspect} and #{b.inspect}" do
        it "returns #{expected}" do
          S[*a].intersect?(S[*b]).should be(expected)
        end
      end
    end
  end
end