Run unit tests in a batch loop

We had a case where a tests was randomly crashing the MSTEST agent process, leave no trace of the root cause. So to reproduce, we ran the test in a loop in both MSTEST and xUnit frameworks using the following scripts, posted here for future reference:

rem Run unit tests in an assembly in a loop using xUnit (build 1705).
FOR /L %%i IN (1,1,5000) DO (
xunit.console.clr4 UnitTests.dll /xml C:\xunit-results\output%%i.xml
)

rem Run unit tests in an assembly in a loop using MSTEST.
FOR /L %%i IN (1,1,5000) DO (
mstest /testcontainer:UnitTests.dll /resultsfile:c:\mstest-results\output%%i.xml
)