AVLab is a Polish-based independent tester of security products. In October 2016 they tested 40 security solutions in their ability to block 28 malicious crypto-ransomeware threats, using Windows 10 Professional x64 systems. You can read an English translation of their results in pdf format here:
avlab.pl/.../ENG_2016_ransomware.pdf

Comment:
I don't speak Polish, and can't vouch for the "independence" or bonafides of AVLab. They seem legit. My security didn't object to their website, and the pdf file was clean. Interesting results. I'm not aware of any other comparative tests that look at ransomware.