added specs for conext 'where the association is changed between mode…

…l versions'

test/unit/associations_test.rb

@@ -776,16 +776,16 @@ class AssociationsTest < ActiveSupport::TestCase
 
       context "where the association is created between model versions" do
         setup do
-          @wotsit = @widget.create_wotsit(name: "wotsit_0")
+          @wotsit = Wotsit.create(name: "wotsit_0")
           Timecop.travel 1.second.since
-          @wotsit.update_attributes name: "wotsit_1"
+          @wotsit.update_attributes widget_id: @widget.id, name: "wotsit_1"
         end
 
         context "when reified" do
           setup { @wotsit_0 = @wotsit.versions.last.reify(belongs_to: true) }
 
           should "see the associated as it was at the time" do
-            assert_equal "widget_0", @wotsit_0.widget.name
+            assert_equal nil, @wotsit_0.widget
           end
 
           should "not persist changes to the live association" do
@@ -824,13 +824,16 @@ class AssociationsTest < ActiveSupport::TestCase
         end
 
         context "and then the associated is destroyed" do
-          setup { @widget.destroy }
+          setup do
+            @wotsit.update_attributes name: "wotsit_2"
+            @widget.destroy
+          end
 
-          context "when reify" do
-            setup { @wotsit_1 = @wotsit.versions.last.reify(belongs_to: true) }
+          context "when reified" do
+            setup { @wotsit_2 = @wotsit.versions.last.reify(belongs_to: true) }
 
             should "see the associated as it was at the time" do
-              assert_equal @widget, @wotsit_1.widget
+              assert_equal @widget, @wotsit_2.widget
             end
 
             should "not persist changes to the live association" do
@@ -854,6 +857,38 @@ class AssociationsTest < ActiveSupport::TestCase
           end
         end
       end
+
+      context "where the association is changed between model versions" do
+        setup do
+          @wotsit = @widget.create_wotsit(name: "wotsit_0")
+          Timecop.travel 1.second.since
+          @new_widget = Widget.create(name: "new_widget")
+          @wotsit.update_attributes(widget_id: @new_widget.id, name: "wotsit_1")
+        end
+
+        context "when reified" do
+          setup { @wotsit_0 = @wotsit.versions.last.reify(belongs_to: true) }
+
+          should "see the association as it was at the time" do
+            assert_equal "widget_0", @wotsit_0.widget.name
+          end
+
+          should "not persist changes to the live association" do
+            assert_equal @new_widget, @wotsit.reload.widget
+          end
+        end
+
+        context "when reified with option mark_for_destruction" do
+          setup do
+            @wotsit_0 = @wotsit.versions.last.
+              reify(belongs_to: true, mark_for_destruction: true)
+          end
+
+          should "should not mark the new associated for destruction" do
+            assert_equal false, @new_widget.marked_for_destruction?
+          end
+        end
+      end
     end
   end
 end