Set the filename after renaming the file.

lib/podcast_press/audio_file.rb

@@ -1,10 +1,11 @@
 require 'taglib'
 require 'ostruct'
 require 'forwardable'
-require 'podcast_press/tag'
+require_relative './tag'
 
 module PodcastPress
   class AudioFile
+    attr_reader :filename
     extend Forwardable
 
     def_delegators :@params, :title, :podcast_title, :date
@@ -36,6 +37,7 @@ def rename!(new_filename)
 
       dir = File.dirname(@filename)
       File.rename(@filename, File.join(dir, new_filename))
+      @filename = new_filename
     end
 
     def upload!(s3_bucket)

specs/podcast_press_spec.rb

@@ -89,6 +89,10 @@
     it "renames the file" do
       File.exist?("#{SANDBOX}/new_file_name.mp3").must_equal true
     end
+
+    it "sets the filename to the new file" do
+      @episode.filename.must_equal 'new_file_name.mp3'
+    end
   end
 
   describe "when #press! is called with an empty hash" do