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-rw-r--r--activemodel/test/cases/validations_test.rb15
1 files changed, 15 insertions, 0 deletions
diff --git a/activemodel/test/cases/validations_test.rb b/activemodel/test/cases/validations_test.rb
index a716d0896e..f9bb877316 100644
--- a/activemodel/test/cases/validations_test.rb
+++ b/activemodel/test/cases/validations_test.rb
@@ -344,4 +344,19 @@ class ValidationsTest < ActiveModel::TestCase
Topic.validates :title, options
assert_equal({ :presence => true }, options)
end
+
+ def test_dup_validity_is_independent
+ Topic.validates_presence_of :title
+ topic = Topic.new("title" => "Litterature")
+ topic.valid?
+
+ duped = topic.dup
+ duped.title = nil
+ assert duped.invalid?
+
+ topic.title = nil
+ duped.title = 'Mathematics'
+ assert topic.invalid?
+ assert duped.valid?
+ end
end