Add missing require

Without this require, an error occurs when executing only `duration_test.rb`. Ref: https://travis-ci.org/rails/rails/jobs/338817558#L2205-L2210
rails · Feb 14, 2018 · 569302b · 569302b
1 parent 90f30ec
commit 569302b
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/activesupport/test/core_ext/duration_test.rb b/activesupport/test/core_ext/duration_test.rb
@@ -3,6 +3,7 @@
 require "active_support/time"
 require "active_support/json"
 require "time_zone_test_helpers"
+require "yaml"
 
 class DurationTest < ActiveSupport::TestCase
   include TimeZoneTestHelpers