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-rw-r--r--activemodel/test/cases/errors_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activemodel/test/cases/errors_test.rb b/activemodel/test/cases/errors_test.rb
index e6ba06301d..0872084cf5 100644
--- a/activemodel/test/cases/errors_test.rb
+++ b/activemodel/test/cases/errors_test.rb
@@ -1,4 +1,5 @@
require "cases/helper"
+require "active_support/core_ext/string/strip"
require "yaml"
class ErrorsTest < ActiveModel::TestCase