override function methods to use appropriate value classes

lib/sassc/rails/template.rb

@@ -79,6 +79,30 @@ def safe_merge(key, left, right)
         right
       end
     end
+
+    # The methods in the Functions module were copied here from sprockets in order to
+    # override the Value class names (e.g. ::SassC::Script::Value::String)
+    module Functions
+      def asset_path(path, options = {})
+        path = path.value
+
+        path, _, query, fragment = URI.split(path)[5..8]
+        path     = sprockets_context.asset_path(path, options)
+        query    = "?#{query}" if query
+        fragment = "##{fragment}" if fragment
+
+        ::SassC::Script::Value::String.new("#{path}#{query}#{fragment}", :string)
+      end
+
+      def asset_url(path, options = {})
+        ::SassC::Script::Value::String.new("url(#{asset_path(path, options).value})")
+      end
+
+      def asset_data_url(path)
+        url = sprockets_context.asset_data_uri(path.value)
+        ::SassC::Script::Value::String.new("url(" + url + ")")
+      end
+    end
   end
 
   class ScssTemplate < SassTemplate

test/sassc_rails_test.rb

@@ -87,9 +87,6 @@ def test_all_sass_asset_paths_work
   end
 
   def test_sass_asset_paths_work
-    # FIX before merging.  this is causing segfault
-    skip
-
     initialize!
 
     css_output = render_asset("helpers_test.css")