1 files changed, 177 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..a2efbf89f9
--- /dev/null
+++ b/activerecord/test/cases/dup_test.rb
@@ -0,0 +1,177 @@
+# frozen_string_literal: true
+
+require "cases/helper"
+require "models/reply"
+require "models/topic"
+require "models/movie"
+
+module ActiveRecord
+  class DupTest < ActiveRecord::TestCase
+    fixtures :topics
+
+    def test_dup
+      assert_not_predicate Topic.new.freeze.dup, :frozen?
+    end
+
+    def test_not_readonly
+      topic = Topic.first
+
+      duped = topic.dup
+      assert_not duped.readonly?, "should not be readonly"
+    end
+
+    def test_is_readonly
+      topic = Topic.first
+      topic.readonly!
+
+      duped = topic.dup
+      assert duped.readonly?, "should be readonly"
+    end
+
+    def test_dup_not_persisted
+      topic = Topic.first
+      duped = topic.dup
+
+      assert_not duped.persisted?, "topic not persisted"
+      assert duped.new_record?, "topic is new"
+    end
+
+    def test_dup_not_destroyed
+      topic = Topic.first
+      topic.destroy
+
+      duped = topic.dup
+      assert_not_predicate duped, :destroyed?
+    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
+      dbtopic = Topic.first
+      topic = Topic.new
+
+      topic.attributes = dbtopic.attributes.except("id")
+
+      # duped has no timestamp values
+      duped = dbtopic.dup
+
+      # clear topic timestamp values
+      topic.send(:clear_timestamp_attributes)
+
+      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
+
+    def test_dup_timestamps_are_cleared
+      topic = Topic.first
+      assert_not_nil topic.updated_at
+      assert_not_nil topic.created_at
+
+      # temporary change to the topic object
+      topic.updated_at -= 3.days
+
+      # dup should not preserve the timestamps if present
+      new_topic = topic.dup
+      assert_nil new_topic.updated_at
+      assert_nil new_topic.created_at
+
+      new_topic.save
+      assert_not_nil new_topic.updated_at
+      assert_not_nil new_topic.created_at
+    end
+
+    def test_dup_after_initialize_callbacks
+      topic = Topic.new
+      assert Topic.after_initialize_called
+      Topic.after_initialize_called = false
+      topic.dup
+      assert Topic.after_initialize_called
+    end
+
+    def test_dup_validity_is_independent
+      repair_validations(Topic) do
+        Topic.validates_presence_of :title
+        topic = Topic.new("title" => "Literature")
+        topic.valid?
+
+        duped = topic.dup
+        duped.title = nil
+        assert_predicate duped, :invalid?
+
+        topic.title = nil
+        duped.title = "Mathematics"
+        assert_predicate topic, :invalid?
+        assert_predicate duped, :valid?
+      end
+    end
+
+    def test_dup_with_default_scope
+      prev_default_scopes = Topic.default_scopes
+      Topic.default_scopes = [proc { Topic.where(approved: true) }]
+      topic = Topic.new(approved: false)
+      assert_not topic.dup.approved?, "should not be overridden by default scopes"
+    ensure
+      Topic.default_scopes = prev_default_scopes
+    end
+
+    def test_dup_without_primary_key
+      skip if current_adapter?(:OracleAdapter)
+
+      klass = Class.new(ActiveRecord::Base) do
+        self.table_name = "parrots_pirates"
+      end
+
+      record = klass.create!
+
+      assert_nothing_raised do
+        record.dup
+      end
+    end
+
+    def test_dup_record_not_persisted_after_rollback_transaction
+      movie = Movie.new(name: "test")
+
+      assert_raises(ActiveRecord::RecordInvalid) do
+        Movie.transaction do
+          movie.save!
+          duped = movie.dup
+          duped.name = nil
+          duped.save!
+        end
+      end
+
+      assert_not movie.persisted?
+    end
+  end
+end