Hand mixer test: stirring, kneading, pureeing How does a hand mixer test work? The testers from Stiftung Warentest made sponge and yeast dough and tested whether the appliances kneaded an even dough. Not all of them got it right: Sometimes there were holes in the baked dough. And since many people also use their mixer as a cream whisk in the kitchen, the hand mixers in the test also had to whip egg...