added jasmine

Rakefile

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+require 'jasmine'
+load 'jasmine/tasks/jasmine.rake'

public/javascripts/Player.js

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+function Player() {
+}
+Player.prototype.play = function(song) {
+  this.currentlyPlayingSong = song;
+  this.isPlaying = true;
+};
+
+Player.prototype.pause = function() {
+  this.isPlaying = false;
+};
+
+Player.prototype.resume = function() {
+  if (this.isPlaying) {
+    throw new Error("song is already playing");
+  }
+
+  this.isPlaying = true;
+};
+
+Player.prototype.makeFavorite = function() {
+  this.currentlyPlayingSong.persistFavoriteStatus(true);
+};

public/javascripts/Song.js

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+function Song() {
+}
+
+Song.prototype.persistFavoriteStatus = function(value) {
+  // something complicated
+  throw new Error("not yet implemented");
+};

spec/javascripts/PlayerSpec.js

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+describe("Player", function() {
+  var player;
+  var song;
+
+  beforeEach(function() {
+    player = new Player();
+    song = new Song();
+  });
+
+  it("should be able to play a Song", function() {
+    player.play(song);
+    expect(player.currentlyPlayingSong).toEqual(song);
+
+    //demonstrates use of custom matcher
+    expect(player).toBePlaying(song);
+  });
+
+  describe("when song has been paused", function() {
+    beforeEach(function() {
+      player.play(song);
+      player.pause();
+    });
+
+    it("should indicate that the song is currently paused", function() {
+      expect(player.isPlaying).toBeFalsy();
+
+      // demonstrates use of 'not' with a custom matcher
+      expect(player).not.toBePlaying(song);
+    });
+
+    it("should be possible to resume", function() {
+      player.resume();
+      expect(player.isPlaying).toBeTruthy();
+      expect(player.currentlyPlayingSong).toEqual(song);
+    });
+  });
+
+  // demonstrates use of spies to intercept and test method calls
+  it("tells the current song if the user has made it a favorite", function() {
+    spyOn(song, 'persistFavoriteStatus');
+
+    player.play(song);
+    player.makeFavorite();
+
+    expect(song.persistFavoriteStatus).toHaveBeenCalledWith(true);
+  });
+
+  //demonstrates use of expected exceptions
+  describe("#resume", function() {
+    it("should throw an exception if song is already playing", function() {
+      player.play(song);
+
+      expect(function() {
+        player.resume();
+      }).toThrow("song is already playing");
+    });
+  });
+});

spec/javascripts/helpers/SpecHelper.js

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+beforeEach(function() {
+  this.addMatchers({
+    toBePlaying: function(expectedSong) {
+      var player = this.actual;
+      return player.currentlyPlayingSong === expectedSong
+          && player.isPlaying;
+    }
+  })
+});

spec/javascripts/support/jasmine.yml

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+# src_files
+#
+# Return an array of filepaths relative to src_dir to include before jasmine specs.
+# Default: []
+#
+# EXAMPLE:
+#
+# src_files:
+#   - lib/source1.js
+#   - lib/source2.js
+#   - dist/**/*.js
+#
+src_files:
+    - public/javascripts/**/*.js
+
+# stylesheets
+#
+# Return an array of stylesheet filepaths relative to src_dir to include before jasmine specs.
+# Default: []
+#
+# EXAMPLE:
+#
+# stylesheets:
+#   - css/style.css
+#   - stylesheets/*.css
+#
+stylesheets:
+
+# helpers
+#
+# Return an array of filepaths relative to spec_dir to include before jasmine specs.
+# Default: ["helpers/**/*.js"]
+#
+# EXAMPLE:
+#
+# helpers:
+#   - helpers/**/*.js
+#
+helpers:
+
+# spec_files
+#
+#  Return an array of filepaths relative to spec_dir to include.
+# Default: ["**/*[sS]pec.js"]
+#
+# EXAMPLE:
+#
+# spec_files:
+#   - **/*[sS]pec.js
+#
+spec_files:
+
+# src_dir
+#
+# Source directory path. Your src_files must be returned relative to this path. Will use root if left blank.
+# Default: project root
+#
+# EXAMPLE:
+#
+# src_dir: public
+#
+src_dir:
+
+# spec_dir
+#
+# Spec directory path. Your spec_files must be returned relative to this path.
+# Default: spec/javascripts
+#
+# EXAMPLE:
+#
+# spec_dir: spec/javascripts
+#
+spec_dir:

spec/javascripts/support/jasmine_runner.rb

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+$:.unshift(ENV['JASMINE_GEM_PATH']) if ENV['JASMINE_GEM_PATH'] # for gem testing purposes
+
+require 'rubygems'
+require 'jasmine'
+jasmine_config_overrides = File.expand_path(File.join(File.dirname(__FILE__), 'jasmine_config.rb'))
+require jasmine_config_overrides if File.exists?(jasmine_config_overrides)
+
+jasmine_config = Jasmine::Config.new
+spec_builder = Jasmine::SpecBuilder.new(jasmine_config)
+
+should_stop = false
+
+Spec::Runner.configure do |config|
+  config.after(:suite) do
+    spec_builder.stop if should_stop
+  end
+end
+
+spec_builder.start
+should_stop = true
+spec_builder.declare_suites