[features] dump matches original metadata

Currently failing

features/step_definitions/thin_steps.rb

@@ -43,13 +43,13 @@ Then(/^it should pass with version$/) do
 end
 
 When(/^I dump$/) do
-  run_simple("thin_dump #{dev_file} -o #{new_dump_file}", false)
+  run_simple("thin_dump #{dev_file} -o #{new_dump_file}", true)
 end
 
 When(/^I restore$/) do
-  run_simple("thin_restore -i #{dump_files[-1]} -o #{dev_file}", false)
+  run_simple("thin_restore -i #{dump_files[-1]} -o #{dev_file}", true)
 end
 
 Then(/^dumps ([0-9]+) and ([0-9]+) should be identical$/) do |d1, d2|
-  run_simple("diff -b #{dump_files[d1.to_i]} #{dump_files[d2.to_i]}", false)
+  run_simple("diff -ub #{dump_files[d1.to_i]} #{dump_files[d2.to_i]}", true)
 end

features/support/world_extensions.rb

@@ -23,7 +23,7 @@ module ThinpWorld
   end
 
   def dump_files
-    @dump_files ||= []
+    @dump_files ||= [xml_file]
   end
 
   def new_dump_file

features/thin_restore.feature

@@ -45,4 +45,9 @@ Feature: thin_restore
     When I dump
     And I restore
     And I dump
+    Then dumps 1 and 2 should be identical
+
+  Scenario: dump matches original metadata
+    Given valid metadata
+    When I dump
     Then dumps 0 and 1 should be identical