1 files changed, 20 insertions, 13 deletions
diff --git a/activesupport/lib/active_support/deprecation.rb b/activesupport/lib/active_support/deprecation.rb
index b4d8f61b8c..b3ad599371 100644
--- a/activesupport/lib/active_support/deprecation.rb
+++ b/activesupport/lib/active_support/deprecation.rb
@@ -221,23 +221,30 @@ class Module
   include ActiveSupport::Deprecation::ClassMethods
 end
 
-require 'test/unit/error'
 
-module Test
-  module Unit
-    class TestCase
-      include ActiveSupport::Deprecation::Assertions
-    end
+require 'active_support/test_case'
+
+class ActiveSupport::TestCase
+  include ActiveSupport::Deprecation::Assertions
+end
+
+begin
+  require 'test/unit/error'
 
-    class Error # :nodoc:
-      # Silence warnings when reporting test errors.
-      def message_with_silenced_deprecation
-        ActiveSupport::Deprecation.silence do
-          message_without_silenced_deprecation
+  module Test
+    module Unit
+      class Error # :nodoc:
+        # Silence warnings when reporting test errors.
+        def message_with_silenced_deprecation
+          ActiveSupport::Deprecation.silence do
+            message_without_silenced_deprecation
+          end
         end
-      end
 
-      alias_method_chain :message, :silenced_deprecation
+        alias_method_chain :message, :silenced_deprecation
+      end
     end
   end
+rescue LoadError
+  # Using miniunit, ignore.
 end