As the defending two-time champions, the Dodgers don’t exactly need litmus tests.

Still, this weekend gave them a chance to size up one of their biggest fellow National League contenders — and reaffirm their own status as MLB’s foremost World Series threat once again.

After dropping a Friday night series opener to the Cubs that ran Chicago’s win streak to 10 games, the Dodgers bounced back the way title-winning teams are supposed to, cruising to back-to-back victories at Dodger Stadium to rally and take the three-game set.

Kyle Tucker went 1-for-3 and scored two runs Sunday against the Cubs.…