gistfile1.rb

## song_tag_spec.rb
describe SongTag do

  before(:each) do
    @song = Song.create(:file_name => "01.testing.mp3")
    @tag = Tag.new(:name => "great")

    @song_tag = @song.song_tags.build(:tag_id => @tag.id)
  end

  it "should create a new instance given valid attributes" do
    @song_tag.save!
  end

  describe "validations" do

    it "should require a song_id" do
      @song_tag.song_id = nil
      @song_tag.should_not be_valid
    end

    it "should require a tag_id" do
      @song_tag.tag_id = nil
      @song_tag.should_not be_valid
    end
  end

  describe "song and tag methods" do

    it "should have a song attribute" do
      @song_tag.should respond_to(:song)
    end

    it "should have the right song" do
      @song_tag.song.should == @song
    end

    it "should have a tag attribute" do
      @song_tag.should respond_to(:tag)
    end

    it "should have the right tag" do
      @song_tag.tag.should == @tag
    end
  end
end


## rspec spec/
..........F.....F..............................

Failures:

  1) SongTag should create a new instance given valid attributes
     Failure/Error: @song_tag.save!
     ActiveRecord::RecordInvalid:
       Validation failed: Tag can't be blank
     # ./spec/models/song_tag_spec.rb:13:in `block (2 levels) in <top (required)>'

  2) SongTag song and tag methods should have the right tag
     Failure/Error: @song_tag.tag.should == @tag
       expected: #<Tag id: nil, name: "great", created_at: nil, updated_at: nil>
            got: nil (using ==)
     # ./spec/models/song_tag_spec.rb:44:in `block (3 levels) in <top (required)>'

Finished in 21.14 seconds
47 examples, 2 failures

Failed examples:

rspec ./spec/models/song_tag_spec.rb:12 # SongTag should create a new instance given valid attributes
rspec ./spec/models/song_tag_spec.rb:43 # SongTag song and tag methods should have the right tag