error

spec.rb

Song
  #initialize
    accepts a name for the new song
  #name
    retrieves the name of a song
  #name=
    can set the name of a song
  @@all
    is initialized as an empty array
  .all
    returns the class variable @@all
  .destroy_all
    resets the @@all class variable to an empty array
  #save
    adds the Song instance to the @@all class variable
  .create
    initializes and saves the song

Artist
  #initialize
    accepts a name for the new artist
  #name
    retrieves the name of an artist
  #name=
    can set the name of an artist
  @@all
    is initialized as an empty array
  .all
    returns the class variable @@all
  .destroy_all
    resets the @@all class variable to an empty array
  #save
    adds the Artist instance to the @@all class variable
  .create
    initializes and saves the artist

Genre
  #initialize
    accepts a name for the new genre
  #name
    retrieves the name of a genre
  #name=
    can set the name of a genre
  @@all
    is initialized as an empty array
  .all
    returns the class variable @@all
  .destroy_all
    resets the @@all class variable to an empty array
  #save
    adds the Genre instance to the @@all class variable
  .create
    initializes and saves the genre

Associations — Song and Artist:
  Artist
    #initialize
      creates a 'songs' property set to an empty array (artist has many songs)
    #songs
      returns the artist's 'songs' collection (artist has many songs)
  Song
    #initialize
      can be invoked with an optional second argument, an Artist object to be assigned to the song's 'artist' property (song belongs to artist) (FAILED - 1)

Failures:

  1) Associations — Song and Artist: Song #initialize can be invoked with an optional second argument, an Artist object to be assigned to the song's 'artist' property (song belongs to artist)
     Failure/Error: expect(song_with_artist.instance_variable_get(:@artist)).to be(artist)

       expected #<Artist:7745020> => #<Artist:0x00000000ec5bf8 @name="Neutral Milk Hotel", @songs=[], @artist=nil>
            got #<Artist:7744880> => #<Artist:0x00000000ec5ae0 @name=#<Artist:0x00000000ec5bf8 @name="Neutral Milk Hotel", @songs=[], @art...Song:0x00000000ec5b08 @name="Two-Headed Boy", @artist=#<Artist:0x00000000ec5ae0 ...>>], @artist=nil>

       Compared using equal?, which compares object identity,
       but expected and actual are not the same object. Use
       `expect(actual).to eq(expected)` if you don't care about
       object identity in this example.


       Diff:
       @@ -1,2 +1,12 @@
       -#<Artist:0x00000000ec5bf8 @artist=nil, @name="Neutral Milk Hotel", @songs=[]>
       +#<Artist:0x00000000ec5ae0
       + @artist=nil,
       + @name=
       +  #<Artist:0x00000000ec5bf8
       +   @artist=nil,
       +   @name="Neutral Milk Hotel",
       +   @songs=[]>,
       + @songs=
       +  [#<Song:0x00000000ec5b08
       +    @artist=#<Artist:0x00000000ec5ae0 ...>,
       +    @name="Two-Headed Boy">]>
     # ./spec/004_songs_and_artists_spec.rb:32:in `block (4 levels) in <top (required)>'

Finished in 0.22632 seconds (files took 0.89813 seconds to load)
27 examples, 1 failure

Failed examples:

rspec ./spec/004_songs_and_artists_spec.rb:28 # Associations — Song and Artist: Song #initialize can be invoked with an optional second argument, an Artist object to be assigned to the song's 'artist' property (song belongs to artist)