2 files changed, 10 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
diff --git a/lib/test/unit/testcase.rb b/lib/test/unit/testcase.rb
index f3d77744eb..02f0f97987 100644
--- a/lib/test/unit/testcase.rb
+++ b/lib/test/unit/testcase.rb
@@ -8,6 +8,10 @@ module Test
     class TestCase < MiniTest::Unit::TestCase
       include Assertions
 
+      def on_parallel_worker?
+        false
+      end
+
       def run runner
         @options = runner.options
         super runner