Running isolated tests

These stopped running don't know when.
But these should be running now.(cherry picked from commit 5eaa30e)

actionpack/Rakefile

@@ -22,11 +22,15 @@ Rake::TestTask.new(:test_action_pack) do |t|
 end
 
 namespace :test do
-  Rake::TestTask.new(:isolated) do |t|
-    t.libs << 'test'
-    t.pattern = 'test/ts_isolated.rb'
+  task :isolated do
+    ruby = File.join(*RbConfig::CONFIG.values_at('bindir', 'RUBY_INSTALL_NAME'))
+    Dir.glob("test/{abstract,controller,dispatch,template}/**/*_test.rb").all? do |file|
+      sh(ruby, '-Ilib:test', file)
+    end or raise "Failures"
   end
+end
 
+namespace :test do
   Rake::TestTask.new(:template) do |t|
     t.libs << 'test'
     t.pattern = 'test/template/**/*.rb'

activesupport/Rakefile

@@ -9,13 +9,16 @@ Rake::TestTask.new do |t|
   t.verbose = true
 end
 
+
 namespace :test do
-  Rake::TestTask.new(:isolated) do |t|
-    t.pattern = 'test/ts_isolated.rb'
+  task :isolated do
+    ruby = File.join(*RbConfig::CONFIG.values_at('bindir', 'RUBY_INSTALL_NAME'))
+    Dir.glob("test/**/*_test.rb").all? do |file|
+      sh(ruby, '-Ilib:test', file)
+    end or raise "Failures"
   end
 end
 
-
 spec = eval(File.read('activesupport.gemspec'))
 
 Gem::PackageTask.new(spec) do |p|