require 'spec_helper'
module Domain
  describe Union, "new" do

    it 'returns the value when it satisfies the predicate' do
      Boolean.new(true).should be(true)
      Boolean.new(false).should be(false)
    end

    it 'raises an argument error when the value is not a superclazz value' do
      lambda{
        Boolean.new("12")
      }.should raise_error(ArgumentError)
    end

  end
end