Kevin Mitnick and KnowBe4 released a ransomware simulator. This windows-based tool is testing different ransomware infections. RanSim does not alter any existing files on disk. Ransomware is hard to catch because it has always an unknown file signature and downloads bad code after it starts. With this tool you can check if you Anti-Virus has such a feature like Anti-Ransomware:
There are several anti-ransomware clients such TrendMicro OfficeScan XG or Sophos Intercept X. Sophos bought the company HitmanPro a while ago and they built Sophos Intercept X. It runs parallel to any Anti-Virus Scan-Engine, so you can mix it with other vendors.