covers 'facets/array/pull'

test_case Array do

  method :peek do

    test do
      a = [1,2,3]
      a.peek.assert == 3
      a.assert == [1,2,3]
    end

    test do
      a = [1,2,3]
      a.peek(1).assert == 2
      a.assert == [1,2,3]
    end

    test do
      a = [1,2,3]
      a.peek(-1).assert == 1
      a.assert == [1,2,3]
    end

  end

end