What was I thinking?

lib/music/csound.rb

@@ -22,13 +22,14 @@ def write(timeline_or_score)
 
       private
         def write_functions(file)
+          return if @functions.empty?
           @functions.each do |(n, t, sz, f, *args)|
             file.write("f %i\t%i\t%i\t%i%s\n" % [
               n, t, sz, f,
               args.empty? ? "" : args.map { |a| "\t#{a}" }.join
             ])
           end
-          file.write("\n") unless @functions.empty?
+          file.write("\n")
         end
 
         def write_instruments(file, timeline)

spec/csound_spec.rb

@@ -14,7 +14,7 @@
   end
 
   it "should write a valid Csound score" do
-    File.should_receive(:open).and_yield(f = mock_file)
+    File.should_receive(:open).and_yield(f = MockFile.new)
     @writer.write(@score)
     f.buf.should == <<SCO
 f 1	0	0	1	example.wav	0	0	0
@@ -28,10 +28,8 @@
 SCO
   end
 
-  def mock_file
-    Class.new {
-      def buf; @buf ||= "" end
-      def write(str) buf << str end
-    }.new
+  class MockFile
+    def buf; @buf ||= "" end
+    def write(str) buf << str end
   end
 end