require 'spec_helper'

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