1 files changed, 10 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/testing/isolation.rb b/activesupport/lib/active_support/testing/isolation.rb
index 27d444fd91..aa87598926 100644
--- a/activesupport/lib/active_support/testing/isolation.rb
+++ b/activesupport/lib/active_support/testing/isolation.rb
@@ -12,8 +12,8 @@ module ActiveSupport
     end
 
     class ProxyTestResult
-      def initialize
-        @calls = []
+      def initialize(calls = [])
+        @calls = calls
       end
 
       def add_error(e)
@@ -27,6 +27,14 @@ module ActiveSupport
         end
       end
 
+      def marshal_dump
+        @calls
+      end
+
+      def marshal_load(calls)
+        initialize(calls)
+      end
+
       def method_missing(name, *args)
         @calls << [name, args]
       end