covers 'facets/module/op.rb'

test_case Module do

  setup do
    @a = Module.new do
      def x; "x"; end
      def z; "zA"; end
    end

    @b = Module.new do
      def y; "y"; end
      def z; "zB"; end
    end
  end

  method :+ do

    test do
      q = @a + @b
      q.extend q

      q.x.assert == "x"
      q.y.assert == "y"
      q.z.assert == "zB"
    end

  end

  method :- do

    test do
      r = @a - @b
      r.extend r

      r.x.assert == "x"
      NoMethodError.assert.raised?{ r.z }
    end

  end

  method :* do

    test do
      z = @a * { :x => :y }
      z.extend z

      z.y.assert == "x"
      z.z.assert == "zA"
      NoMethodError.assert.raised?{ z.x }
    end

  end

end