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-rw-r--r--activesupport/lib/active_support/test_case.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/test_case.rb b/activesupport/lib/active_support/test_case.rb
index bab2a401eb..e99a4854ce 100644
--- a/activesupport/lib/active_support/test_case.rb
+++ b/activesupport/lib/active_support/test_case.rb
@@ -13,6 +13,7 @@ require 'active_support/testing/assertions'
require 'active_support/testing/deprecation'
require 'active_support/testing/declarative'
require 'active_support/testing/pending'
+require 'active_support/testing/isolation'
module ActiveSupport
class TestCase < ::Test::Unit::TestCase