add windows tests

Author: lorenzwalthert

azure-pipelines.yml

@@ -26,6 +26,10 @@ jobs:
         Write-Host "##vso[task.prependpath]C:\Strawberry\perl\site\bin"
         Write-Host "##vso[task.prependpath]C:\Strawberry\c\bin"
       displayName: Add strawberry perl to PATH
+    - task: PowerShell@2
+      inputs:
+        filePath: "testing/get-renv.ps1"
+      displayName: install R (for language renv)
 - template: job--python-tox.yml@asottile
   parameters:
     toxenvs: [py37]

testing/get-renv.ps1

@@ -1,7 +1,6 @@
-$dir = "C:\R\R-win.exe"
+$dir = $Env:Temp
 $urlR = "https://cran.r-project.org/bin/windows/base/R-4.0.3-win.exe"
 $outputR = "$dir\R-win.exe"
 $wcR = New-Object System.Net.WebClient
 $wcR.DownloadFile($urlR, $outputR)
-$dirR = $dir + "R-win.exe"
-Start-Process -FilePath $dirR -ArgumentList "/S /v/qn"
+Start-Process -FilePath $outputR -ArgumentList "/S /v/qn"