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-rw-r--r--activesupport/test/core_ext/time_with_zone_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/time_with_zone_test.rb b/activesupport/test/core_ext/time_with_zone_test.rb
index 54ef81aee8..477a42114b 100644
--- a/activesupport/test/core_ext/time_with_zone_test.rb
+++ b/activesupport/test/core_ext/time_with_zone_test.rb
@@ -2,6 +2,7 @@ require 'abstract_unit'
require 'active_support/time'
require 'time_zone_test_helpers'
require 'active_support/core_ext/string/strip'
+require 'yaml'
class TimeWithZoneTest < ActiveSupport::TestCase
include TimeZoneTestHelpers