From: Mac Flores <mac.flores@...>
Date: 2008-02-29T22:45:24+09:00
Subject: HELP: NameError: uninitialized constant

OK.  I'm learning Ruby by going through the examples in Programming Ruby
by Dave Thomas.  Somehow I'm stuck and I cannot progress further.  I
have 3 files all in the same folder -- Song.rb, SongList.rb and
TestSongList.rb. Code is as follows:

## Song.rb
class Song
    attr_reader :name, :artist, :duration
    attr_writer :duration
    @@plays=0
    def initialize(name,artist,duration)
        @name=name
        @artist=artist
        @duration=duration
        @plays=0
    end
end

## SongList.rb
def SongList
    def initialize
        @songs = Array.new
    end

    def append(song)
        @songs.push(song)
        self
    end
end

## TestSongList.rb
require 'test/unit'
class TestSongList < Test::Unit::TestCase
    def test_delete
        list = SongList.new
        s1 = Song.new('title1','artist1',1)
        s2 = Song.new('title2','artist2',2)
        s3 = Song.new('title3','artist3',3)
        s4 = Song.new('title4','artist4',4)
        list.append(s1).append(s2).append(s3).append(s4)

        assert_equal(s1, list[0])
    end
end

So I run the test and I get this:
[ookman@foorubyfiles]$ ruby ./TestSongList.rb
Loaded suite ./TestSongList
Started
E
Finished in 0.000414 seconds.

  1) Error:
test_delete(TestSongList):
NameError: uninitialized constant TestSongList::SongList
    ./TestSongList.rb:4:in `test_delete'

1 tests, 0 assertions, 0 failures, 1 errors

Can anybody tell me why it's giving me the above error on this line?
list = SongList.new

I've tried to do:
require 'SongList' at the top of TestSongList.rb but I get the same
error. I've Googled this problem but I cannot find a resolution. I also
tried to run the TestSongList code one line at a time in irb and it
gives me the same error when it reaches line 4.

Ruby version is:
 ruby 1.8.6 (2007-03-13 patchlevel 0) [i686-linux]

I appreciate any insight .... TIA!
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