get Preparing modules for first use. when I use train on Windows

[chris-rock]

As we experienced in our own tests on appveyor, powershell throws a Preparing modules for first use.. The use of $ProgressPreference='SilentlyContinue'; is not solving the issue.

  2) Failure:
windows local command#test_0002_run echo test [test/windows/local_test.rb:33]:
--- expected
+++ actual
@@ -1,2 +1,3 @@
 # encoding: UTF-8
-""
+"#< CLIXML\r
+<Objs Version=\"1.1.0.1\" xmlns=\"http://schemas.microsoft.com/powershell/2004/04\"><Obj S=\"progress\" RefId=\"0\"><TN RefId=\"0\"><T>System.Management.Automation.PSCustomObject</T><T>System.Object</T></TN><MS><I64 N=\"SourceId\">1</I64><PR N=\"Record\"><AV>Preparing modules for first use.</AV><AI>0</AI><Nil /><PI>-1</PI><PC>-1</PC><T>Completed</T><SR>-1</SR><SD> </SD></PR></MS></Obj><Obj S=\"progress\" RefId=\"1\"><TNRef RefId=\"0\" /><MS><I64 N=\"SourceId\">2</I64><PR N=\"Record\"><AV>Preparing modules for first use.</AV><AI>0</AI><Nil /><PI>-1</PI><PC>-1</PC><T>Completed</T><SR>-1</SR><SD> </SD></PR></MS></Obj></Objs>

[chris-rock]

As highlighted by @IlyaFinkelshteyn (THANKS APPVEYOR 💯 ) the real solution is to use powershell -NoProfile