2 files changed, 14 insertions, 0 deletions
diff --git a/activemodel/test/cases/errors_test.rb b/activemodel/test/cases/errors_test.rb
index 4edeece3e8..ab80f193b6 100644
--- a/activemodel/test/cases/errors_test.rb
+++ b/activemodel/test/cases/errors_test.rb
@@ -40,6 +40,14 @@ class ErrorsTest < ActiveModel::TestCase
     assert errors.include?(:foo), 'errors should include :foo'
   end
 
+  def test_dup
+    errors = ActiveModel::Errors.new(self)
+    errors[:foo] = 'bar'
+    errors_dup = errors.dup
+    errors_dup[:bar] = 'omg'
+    assert_not_same errors_dup.messages, errors.messages
+  end
+
   def test_has_key?
     errors = ActiveModel::Errors.new(self)
     errors[:foo] = 'omg'
diff --git a/activemodel/test/cases/validations_test.rb b/activemodel/test/cases/validations_test.rb
index 2f4376bd41..ed4d8fcdca 100644
--- a/activemodel/test/cases/validations_test.rb
+++ b/activemodel/test/cases/validations_test.rb
@@ -330,4 +330,10 @@ class ValidationsTest < ActiveModel::TestCase
       Topic.new.valid?
     end
   end
+
+  def test_does_not_modify_options_argument
+    options = {:presence => true}
+    Topic.validates :title, options
+    assert_equal({:presence => true}, options)
+  end
 end