Implement track/stream

* Add Streamer class
* Use FactoryGirl for factories
* Add sha256 field to tracks
* Add mime_type field to tracks

spec/models/track_spec.rb

@@ -9,30 +9,51 @@ describe Track do
   end
 
   context 'when name empty' do
-    before do
-      track.name = ''
-    end
-
+    before { track.name = '' }
     it { should_not be_valid }
   end
 
-  describe '#uploaded_file=' do
-    let(:track) { Track.new :name => 'Mega song' }
+  context 'when mime_type empty' do
+    before { track.mime_type = '' }
+    it { should_not be_valid }
+  end
 
-    it 'saves an uploaded file' do
-      filepath = "#{Rails.root}/spec/fixtures/test.mp3"
-      file = mock(Rack::Test::UploadedFile)
-      file.stub(
-        :tempfile     => File.new(filepath),
-        :content_type => 'audio/mpeg'
-      )
-      track.uploaded_file = file
-      track.save
-      File.read("#{Rails.root}/data/tracks/#{track.id.to_s}").should == File.read(filepath)
+  context 'when sha256 empty' do
+    before { track.sha256 = '' }
+    it { should_not be_valid }
+  end
+
+  describe '#filepath' do
+    it 'returns the path to the track file' do
+      track.filepath.should == "#{Rails.root}/data/tracks/#{track.sha256}"
+    end
+  end
+
+  describe '#save_with_file' do
+    let(:file) { File.new("#{Rails.root}/spec/fixtures/test.mp3") }
+
+    it 'calls save' do
+      Track.any_instance.should_receive(:save!)
+      track.save_with_file(file, 'audio/ogg')
+    end
+
+    it 'saves the file content' do
+      track.save_with_file(file, 'audio/ogg')
+      File.read(track.filepath).should == File.read(file.path)
+    end
+
+    it 'saves the file SHA256 digest' do
+      track.save_with_file(file, 'audio/ogg')
+      track.sha256.should == Digest::SHA256.file(file.path).hexdigest
+    end
+
+    it 'saves the file mime type' do
+      track.save_with_file(file, 'audio/mpeg')
+      track.mime_type.should == 'audio/mpeg'
     end
 
     after do
-      `rm -rf #{Rails.root}/data/tracks/*`
+      `rm -f #{Rails.root}/data/tracks/*`
     end
   end
 end