1 files changed, 6 insertions, 0 deletions
diff --git a/actionmailer/Rakefile b/actionmailer/Rakefile
index f06f18ff76..24c25abc8b 100644
--- a/actionmailer/Rakefile
+++ b/actionmailer/Rakefile
@@ -28,6 +28,12 @@ Rake::TestTask.new { |t|
   t.warning = false
 }
 
+task :isolated_test do
+  ruby = File.join(*RbConfig::CONFIG.values_at('bindir', 'RUBY_INSTALL_NAME'))
+  Dir.glob("test/*_test.rb").all? do |file|
+    system(ruby, '-Ilib:test', file)
+  end or raise "Failures"
+end
 
 # Generate the RDoc documentation
 Rake::RDocTask.new { |rdoc|