Add additional assert that more clearly exposes the fact that ArtistsTrack's artistic_role_id is being lost

#10945

# Activate the gem you are reporting the issue against.
gem 'activerecord', '4.0.0'
require 'active_record'
require 'minitest/autorun'
require 'logger'

# This connection will do for database-independent bug reports.
# ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: 'shiz.db')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :artists do |t|
  end
  create_table :tracks do |t|
  end
  create_table :artistic_roles do |t|
  end

  create_table :artists_tracks do |t|
    t.integer :artist_id
    t.integer :track_id
    t.integer :artistic_role_id
  end
end

class Track < ActiveRecord::Base
  has_many :artists_tracks
  has_many :owning_artists,
              -> { where(:artists_tracks => { :artistic_role_id => 1 }) },
              :through => :artists_tracks,
              :source => :artist
end

class ArtistsTrack < ActiveRecord::Base
  belongs_to :artist
  belongs_to :track
  belongs_to :artistic_role
end

class Artist < ActiveRecord::Base
  has_many :artists_tracks
  has_many :tracks, :through => :artists_tracks
end

class ArtisticRole < ActiveRecord::Base
  has_many :artist_tracks
  has_many :tracks, through: :artists_tracks
  has_many :artists, through: :artists_tracks
end

track = Track.create!
artist = Artist.create!
role = ArtisticRole.create!
ArtistsTrack.create(track: track, artist: artist, artistic_role: role)

class ScopeTest < MiniTest::Unit::TestCase
  def test_scoped_finding
    assert_equal 1, Track.first.owning_artists.count
  end
  def test_scoped_creation
    Track.create!(owning_artist_ids: [1])
    assert_equal 1, ArtistsTrack.last.artistic_role_id
    assert_equal 2, Track.count
    assert_equal 1, Track.last.owning_artist_ids.length
    assert_equal 1, Track.last.owning_artist_ids.first
  end
end