There have been several tests that have been conducted that pointed to the violation of local realism and consistent with quantum mechanics. I've indicated at least two recently (this, and this). Now come the most spectacular demonstration yet of such violation, and this one comes from what the authors claim to be an experiment free of the detection loophole and locality loophole.
The preprint appeared a while back on ArXiv, but the paper has finally been published in this week's issue of Nature (Oct. 21, 2015). So even if you don't have access to the Nature article, you should be able to read the preprint.