Duolingo English Test

Accepted by +5500 Higher Education Institutions (Harvard, Yale or Stanford among them) and only costing $49? No wonder more and more students are taking that test. 

I've been having a look and the research seems to be solid. You can have a look at the way it's been developed here: https://duolingo-papers.s3.amazonaws.com/other/technical_manual.pdf

The CRUE has not accepted it yet, but I don't know what will happen in the future...