Ruby: Creating a test spec with simplecov for a jukebox

jukebox_spec.rb

require 'simplecov'
SimpleCov.start
require 'json'
require 'rspec'
 
require_relative '../lib/jukebox'
require_relative '../lib/song'
 
#use this song data for your tests
songs = [
  "The Phoenix - 1901",
  "Tokyo Police Club - Wait Up",
  "Sufjan Stevens - Too Much",
  "The Naked and the Famous - Young Blood",
  "(Far From) Home - Tiga",
  "The Cults - Abducted",
  "The Phoenix - Consolation Prizes"
]
 
describe Song do
  it 'should have a name' do
    song = Song.new('1901')
  end
end
 
describe Jukebox do
  let(:jukebox) {Jukebox.new(songs.map {|song| Song.new(song)})}
  it 'should be on and have a list of songs' do
    jukebox.on?
    jukebox.songs.should be_a_kind_of(Array) 
  end

  it 'should return a help string when calling for help' do
    jukebox.help.should eq("Please select help, list, exit, or play.")
  end

  it 'should say goodbye and be off when calling exit' do
    jukebox.exit.should eq("Goodbye, thanks for listening!")
    !jukebox.on?
  end

  it 'should present a list of songs when calling list' do
    song_list = jukebox.list
    song_list.should be_a_kind_of(String)
    song_list.should include('1901')
  end

  it 'should return a now playing string when calling play' do
    jukebox.play('1901').should eq("now playing 1901")
  end

  describe '#command' do
    it 'should receive a message for help, list, or exit' do
      ['help', 'list', 'exit'].each do |cmd|
        jukebox.send(:command, cmd)
        jukebox.should respond_to(cmd.to_sym)
      end
    end

    it 'should return a message when asking to play a song' do
      jukebox.command('play 1901').should eq('now playing 1901')
    end

    it 'should provide an invalid response for unknown command' do
      jukebox.command('hjybjhl').should eq('invalid command')
    end
  end
end