1 files changed, 26 insertions, 2 deletions
diff --git a/activerecord/test/cases/associations/has_one_associations_test.rb b/activerecord/test/cases/associations/has_one_associations_test.rb
index 1a213ef7e4..d7e898a1c0 100644
--- a/activerecord/test/cases/associations/has_one_associations_test.rb
+++ b/activerecord/test/cases/associations/has_one_associations_test.rb
@@ -452,7 +452,7 @@ class HasOneAssociationsTest < ActiveRecord::TestCase
     assert_equal new_ship, pirate.ship
     assert_predicate new_ship, :new_record?
     assert_nil orig_ship.pirate_id
-    assert !orig_ship.changed? # check it was saved
+    assert_not orig_ship.changed? # check it was saved
   end
 
   def test_creation_failure_with_dependent_option
@@ -678,7 +678,7 @@ class HasOneAssociationsTest < ActiveRecord::TestCase
     book = SpecialBook.create!(status: "published")
     author.book = book
 
-    refute_equal 0, SpecialAuthor.joins(:book).where(books: { status: "published" }).count
+    assert_not_equal 0, SpecialAuthor.joins(:book).where(books: { status: "published" }).count
   end
 
   def test_association_enum_works_properly_with_nested_join
@@ -725,4 +725,28 @@ class HasOneAssociationsTest < ActiveRecord::TestCase
 
     assert_not DestroyByParentBook.exists?(book.id)
   end
+
+  class UndestroyableBook < ActiveRecord::Base
+    self.table_name = "books"
+    belongs_to :author, class_name: "DestroyableAuthor"
+    before_destroy :dont
+
+    def dont
+      throw(:abort)
+    end
+  end
+
+  class DestroyableAuthor < ActiveRecord::Base
+    self.table_name = "authors"
+    has_one :book, class_name: "UndestroyableBook", foreign_key: "author_id", dependent: :destroy
+  end
+
+  def test_dependency_should_halt_parent_destruction
+    author = DestroyableAuthor.create!(name: "Test")
+    UndestroyableBook.create!(author: author)
+
+    assert_no_difference ["DestroyableAuthor.count", "UndestroyableBook.count"] do
+      assert_not author.destroy
+    end
+  end
 end