1 files changed, 11 insertions, 0 deletions
diff --git a/activerecord/test/cases/associations/has_one_associations_test.rb b/activerecord/test/cases/associations/has_one_associations_test.rb
index 9cd4db8dc9..cdd386187b 100644
--- a/activerecord/test/cases/associations/has_one_associations_test.rb
+++ b/activerecord/test/cases/associations/has_one_associations_test.rb
@@ -524,4 +524,15 @@ class HasOneAssociationsTest < ActiveRecord::TestCase
     assert_equal 'new name', pirate.ship.reload.name
   end
 
+  def test_has_one_autosave_with_primary_key_manually_set
+    post = Post.create(id: 1234, title: "Some title", body: 'Some content')
+    author = Author.new(id: 33, name: 'Hank Moody')
+
+    author.post = post
+    author.save
+    author.reload
+
+    assert_not_nil author.post
+    assert_equal author.post, post
+  end
 end