file_tests now all pass under mocking.

put_object persists certain object headers like Content-Disposition.

lib/fog/rackspace/requests/storage/put_object.rb

@@ -39,6 +39,11 @@ module Fog
       end
 
       class Mock
+        HeaderOptions = %w{
+          Content-Type Access-Control-Allow-Origin Origin Content-Disposition
+          Etag Content-Encoding
+        }.freeze
+
         def put_object(container, object, data, options = {}, &block)
           c = mock_container! container
 
@@ -51,7 +56,18 @@ module Fog
             end
           end
 
-          c.add_object object, data
+          o = c.add_object object, data
+          options.keys.each do |k|
+            o.meta[k] = options[k].to_s if k =~ /^X-Object-Meta/
+            o.meta[k] = options[k] if HeaderOptions.include? k
+          end
+
+          # Validate the provided Etag
+          etag = o.meta['Etag']
+          if etag && etag != o.hash
+            c.remove_object object
+            raise Fog::Storage::Rackspace::ServiceError.new
+          end
 
           response = Excon::Response.new
           response.status = 201

tests/rackspace/models/storage/file_tests.rb

@@ -30,8 +30,6 @@ Shindo.tests('Fog::Rackspace::Storage | file', ['rackspace']) do
     end
   end
 
-  pending if Fog.mocking?
-
   def object_attributes(file=@instance)
     @instance.service.head_object(@directory.key, file.key).headers
   end