# File test/test_rrdtool.rb, line 120
  def test_last
    # first and last should raise an exception without an RRD file
    assert_raise RRDtoolError do
      @r.last
    end
    create_file
    l = @r.last
    assert l > 0
    assert_equal @start, l
    create_data
    l = @r.last
    assert l > @start
  end