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-rw-r--r--activesupport/test/core_ext/duration_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/duration_test.rb b/activesupport/test/core_ext/duration_test.rb
index 05f529dc7d..710c221fac 100644
--- a/activesupport/test/core_ext/duration_test.rb
+++ b/activesupport/test/core_ext/duration_test.rb
@@ -5,6 +5,7 @@ class DurationTest < ActiveSupport::TestCase
def test_is_a
d = 1.day
assert d.is_a?(ActiveSupport::Duration)
+ assert_kind_of ActiveSupport::Duration, d
assert_kind_of Numeric, d
assert_kind_of Fixnum, d
assert !d.is_a?(Hash)