test setting parent and parent_id set the other

test/concerns/setter_test.rb

@@ -0,0 +1,47 @@
+require_relative '../environment'
+
+class IntegrityCheckingAndRestaurationTest < ActiveSupport::TestCase
+  def test_set_parent
+    AncestryTestDatabase.with_model do |model|
+      model.destroy_all
+      parent1 = model.create!
+      parent2 = model.create!
+      child   = model.create!(:parent => parent1)
+
+      assert_equal child.ancestor_ids, parent1.path_ids
+
+      child.parent = parent2
+      assert_equal child.parent_id, parent2.id
+      child.save
+
+      assert_equal child.ancestor_ids, parent2.path_ids
+      assert_equal child.parent_id, parent2.id
+
+      child.reload
+      assert_equal child.ancestor_ids, parent2.path_ids
+      assert_equal child.parent_id, parent2.id
+    end
+  end
+
+  def test_set_parent_id
+    AncestryTestDatabase.with_model do |model|
+      model.destroy_all
+      parent1 = model.create!
+      parent2 = model.create!
+      child   = model.create!(:parent_id => parent1.id)
+
+      assert_equal child.ancestor_ids, parent1.path_ids
+
+      child.parent_id = parent2.id
+      assert_equal child.parent, parent2
+      child.save
+
+      assert_equal child.ancestor_ids, parent2.path_ids
+      assert_equal child.parent, parent2
+
+      child.reload
+      assert_equal child.ancestor_ids, parent2.path_ids
+      assert_equal child.parent, parent2
+    end
+  end
+end