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-rw-r--r--activerecord/test/cases/migration_test.rb5
1 files changed, 3 insertions, 2 deletions
diff --git a/activerecord/test/cases/migration_test.rb b/activerecord/test/cases/migration_test.rb
index 741bec6017..15a0e0516d 100644
--- a/activerecord/test/cases/migration_test.rb
+++ b/activerecord/test/cases/migration_test.rb
@@ -1,6 +1,7 @@
-require "cases/helper"
-require "cases/migration/helper"
+require 'cases/helper'
+require 'cases/migration/helper'
require 'bigdecimal/util'
+require 'concurrent/atomic/count_down_latch'
require 'models/person'
require 'models/topic'