# File test/test_rrdtool.rb, line 77 def test_first # first and last should raise an exception without an RRD file assert_raise RRDtoolError do @r.first 0 end create_file (0..1).each do |i| f = @r.first i assert_not_nil f assert f > 0 end assert_raise RRDtoolError do f2 = @r.first 2 end end