1 files changed, 61 insertions, 0 deletions
diff --git a/activerecord/test/cases/dup_test.rb b/activerecord/test/cases/dup_test.rb
new file mode 100644
index 0000000000..fa528c4936
--- /dev/null
+++ b/activerecord/test/cases/dup_test.rb
@@ -0,0 +1,61 @@
+require "cases/helper"
+require 'models/topic'
+
+module ActiveRecord
+  class DupTest < ActiveRecord::TestCase
+    fixtures :topics
+
+    def test_dup
+      assert !Topic.new.freeze.dup.frozen?
+    end
+
+    def test_dup_not_persisted
+      topic = Topic.first
+      duped = topic.dup
+
+      assert !duped.persisted?, 'topic not persisted'
+      assert duped.new_record?, 'topic is new'
+    end
+
+    def test_dup_has_no_id
+      topic = Topic.first
+      duped = topic.dup
+      assert_nil duped.id
+    end
+
+    def test_dup_with_modified_attributes
+      topic = Topic.first
+      topic.author_name = 'Aaron'
+      duped = topic.dup
+      assert_equal 'Aaron', duped.author_name
+    end
+
+    def test_dup_with_changes
+      topic = Topic.first
+      topic.author_name = 'Aaron'
+      duped = topic.dup
+      assert_equal topic.changes, duped.changes
+    end
+
+    def test_dup_topics_are_independent
+      topic = Topic.first
+      topic.author_name = 'Aaron'
+      duped = topic.dup
+
+      duped.author_name = 'meow'
+
+      assert_not_equal topic.changes, duped.changes
+    end
+
+    def test_dup_attributes_are_independent
+      topic = Topic.first
+      duped = topic.dup
+
+      duped.author_name = 'meow'
+      topic.author_name = 'Aaron'
+
+      assert_equal 'Aaron', topic.author_name
+      assert_equal 'meow', duped.author_name
+    end
+  end
+end