Merge pull request rails#25766 from vipulnsward/fix-ac-tests-2-4

Fix AJ tests on ruby 2.4 being caused since classes are unified for Integer

Author: rafaelfranca

activejob/test/cases/argument_serialization_test.rb

@@ -14,7 +14,7 @@ class ArgumentSerializationTest < ActiveSupport::TestCase
     [ 1, 'a' ],
     { 'a' => 1 }
   ].each do |arg|
-    test "serializes #{arg.class} verbatim" do
+    test "serializes #{arg.class} - #{arg} verbatim" do
       assert_arguments_unchanged arg
     end
   end