Job step configuration has not changed and upating plugin to last 1.2.0 results in a build failure with this message :

Path To MSTest.exe: C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\MSTest.exe
Result file was not found so no action has been taken. file:/E:/Jenkins/workspace/DataEngine/DATAFEED.Ping/DATAFEED.Ping/DATAFEED.Tests.trx
FATAL: No test files was found
Build step 'Run unit tests with MSTest' marked build as failure

Configuration is as in the attached file.
Downgrading back to v1.1.2 restores the successfull job execution with unit tests run.

thanks for your help on that.