1 files changed, 6 insertions, 0 deletions
diff --git a/lib/test/unit/parallel.rb b/lib/test/unit/parallel.rb
index deda1d1ef5..ab9e864509 100644
--- a/lib/test/unit/parallel.rb
+++ b/lib/test/unit/parallel.rb
@@ -2,6 +2,12 @@ require 'test/unit'
 
 module Test
   module Unit
+    class TestCase < MiniTest::Unit::TestCase
+      def on_parallel_worker?
+        true
+      end
+    end
+
     class Worker < Runner
       class << self
         undef autorun