add test coverage for activemodel Dirty#reset_changes

1 files changed, 19 insertions, 0 deletions

diff --git a/activemodel/test/cases/dirty_test.rb b/activemodel/test/cases/dirty_test.rb
index 8b55901a65..2853476c91 100644
--- a/activemodel/test/cases/dirty_test.rb
+++ b/activemodel/test/cases/dirty_test.rb
@@ -41,6 +41,10 @@ class DirtyTest < ActiveModel::TestCase
     def save
       changes_applied
     end
+
+    def reload
+      reset_changes
+    end
   end
 
   setup do
@@ -157,4 +161,19 @@ class DirtyTest < ActiveModel::TestCase
     @model.size = 1
     assert @model.size_changed?
   end
+
+  test "reload should reset all changes" do
+    @model.name = 'Dmitry'
+    @model.name_changed?
+    @model.save
+    @model.name = 'Bob'
+
+    assert_equal [nil, 'Dmitry'], @model.previous_changes['name']
+    assert_equal 'Dmitry', @model.changed_attributes['name']
+
+    @model.reload
+
+    assert_equal ActiveSupport::HashWithIndifferentAccess.new, @model.previous_changes
+    assert_equal ActiveSupport::HashWithIndifferentAccess.new, @model.changed_attributes
+  end
 end