# File test.bak/tc_dos_disks.rb, line 151
        def test_40_track_file
                dskname=File.dirname(__FILE__)+"//white_03b.dsk"
                dsk=DSK.read(dskname)
                assert_equal(:dos,dsk.file_system,"#{dskname} should be DOS 3.3 format")
                assert(dsk.files.length>0,"#{dskname} should have at least one file")
                assert_equal(40,dsk.track_count,"#{dskname} should have 40 tracks")

                pic_file=dsk.files["RIP.PIC"]
                assert(pic_file!=nil,"#{dskname} should have a file called RIP.PIC")
                assert(pic_file.instance_of?(BinaryFile),"RIP.PIC should be a binary file")
                assert(pic_file.can_be_picture?,"RIP.PIC should be viewable as a picture")
                assert_equal("\211PNG\r\n\032\n",pic_file.to_png[0..7])
        end