TechEmpower/FrameworkBenchmarks — pull request #550 by MalcolmEvershed (2013-10-23 02:52:05+00:00)
Title: Improve setup robustness of Windows tests

In an attempt to solve or figure out the supposed performance regression described at the bottom of #539:

* In PowerShell scripts:
* Use $ErrorActionPreference = 'Stop' so we stop on any error
* Use Exec helper that throws an error on any errorlevel
* Try not to use -ErrorAction SilentlyContinue as often

* In Python scripts:
* Use powershell -Command instead of -File which does not propagate
the errorlevel properly.
* For stop(), use subprocess.check_call() which is synchronous and
which can check the exit code, unlike subprocess.Popen() which
is asynchronous.