I tested them in the rain, yes. And I also tested them with a garden hose. When I push the auto wiper button, they swipe once when the green LED comes on, and that's it. The LED light remains illuminated, but I can spray water on it, drive through mist, or a torrential downpour, and nothing changes. The wipers remain still at the bottom of the windshield.

Also, per the comment above about the brand of glass, my glass is Pilkington, so it is an OE supplied brand.

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2007 BMW X5 4.8i - Sport Package, Wife's Car

2001 BMW 325i - My Car.

2005 Ford Excursion Limited 4x4, 6.0 Powerstroke Diesel. My first "grown up" car.