Add file and filename_changed? method

lib/image_sorcery.rb

@@ -1,6 +1,8 @@
 require 'gm_support'
 
 class Sorcery
+  attr_reader :file
+
   def initialize(file)
     @file = file
   end
@@ -79,11 +81,16 @@ def montage(sources, args={})
     success = run(tokens)[1]
   end
 
+  def filename_changed?
+    (@filename_changed)
+  end
+
   private
 
   def replace_file(format)
     File.delete @file
     @file = File.join File.dirname(@file), File.basename(@file, File.extname(@file)) + "." + format
+    @filename_changed = true
   end
 
   def convert_to_command(tokens)

spec/image_sorcery_examples_spec.rb

@@ -25,6 +25,10 @@
       image.height.should == 120
     end
 
+    its(:filename_changed?) { should be_false }
+
+    its(:file) { should eq "./spec/fixtures/dog-2.jpeg" }
+
     describe "change of format" do
       before :each do
         image.manipulate!(:format => "png")
@@ -40,6 +44,10 @@
         end
 
         its(:identify) { should include "PNG 160x120" }
+
+        its(:filename_changed?) { should be_true }
+
+        its(:file) { should eq "./spec/fixtures/dog-2.png" }
       end
 
       describe "with multi page pdf" do
@@ -57,6 +65,8 @@
         end
 
         its(:identify) { should include "PNG 595x842" }
+
+        its(:filename_changed?) { should be_true }
       end
     end
   end