1 files changed, 34 insertions, 0 deletions
diff --git a/activerecord/test/cases/fixtures_test.rb b/activerecord/test/cases/fixtures_test.rb
index fe2f417a04..32021c5ebd 100644
--- a/activerecord/test/cases/fixtures_test.rb
+++ b/activerecord/test/cases/fixtures_test.rb
@@ -1362,3 +1362,37 @@ class NilFixturePathTest < ActiveRecord::TestCase
     MSG
   end
 end
+
+class MultipleDatabaseFixturesTest < ActiveRecord::TestCase
+  test "enlist_fixture_connections ensures multiple databases share a connection pool" do
+    with_temporary_connection_pool do
+      ActiveRecord::Base.connects_to database: { writing: :arunit, reading: :arunit2 }
+
+      rw_conn = ActiveRecord::Base.connection
+      ro_conn = ActiveRecord::Base.connection_handlers[:reading].connection_pool_list.first.connection
+
+      assert_not_equal rw_conn, ro_conn
+
+      enlist_fixture_connections
+
+      rw_conn = ActiveRecord::Base.connection
+      ro_conn = ActiveRecord::Base.connection_handlers[:reading].connection_pool_list.first.connection
+
+      assert_equal rw_conn, ro_conn
+    end
+  ensure
+    ActiveRecord::Base.connection_handlers = { writing: ActiveRecord::Base.connection_handler }
+  end
+
+  private
+
+    def with_temporary_connection_pool
+      old_pool = ActiveRecord::Base.connection_handler.retrieve_connection_pool(ActiveRecord::Base.connection_specification_name)
+      new_pool = ActiveRecord::ConnectionAdapters::ConnectionPool.new ActiveRecord::Base.connection_pool.spec
+      ActiveRecord::Base.connection_handler.send(:owner_to_pool)["primary"] = new_pool
+
+      yield
+    ensure
+      ActiveRecord::Base.connection_handler.send(:owner_to_pool)["primary"] = old_pool
+    end
+end