add jasmine examples.

2 files changed, 67 insertions, 0 deletions

diff --git a/spec/javascripts/helpers/SpecHelper.js b/spec/javascripts/helpers/SpecHelper.js
new file mode 100644
index 00000000..4919c87a
--- /dev/null
+++ b/spec/javascripts/helpers/SpecHelper.js
@@ -0,0 +1,9 @@
+beforeEach(function() {
+  this.addMatchers({
+    toBePlaying: function(expectedSong) {
+      var player = this.actual;
+      return player.currentlyPlayingSong === expectedSong
+          && player.isPlaying;
+    }
+  })
+});
diff --git a/spec/javascripts/jasmine_examples/PlayerSpec.js b/spec/javascripts/jasmine_examples/PlayerSpec.js
new file mode 100644
index 00000000..79f10221
--- /dev/null
+++ b/spec/javascripts/jasmine_examples/PlayerSpec.js
@@ -0,0 +1,58 @@
+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");
+    });
+  });
+});
\ No newline at end of file