Run httpbin in appveyor.yml to be able to stop it later

There is no way to stop a background task simply and safely with
cmd.exe, but in appveyor.yml we can use PowerShell, so use its job
support to do it instead.

This is important because AppVeyor waits until all jobs launched by the
script terminate, so without stopping the background job all builds
waited for an hour before timing out.

appveyor.yml

@@ -71,4 +71,19 @@ before_build:
 
 build_script: c:\projects\wxwidgets\build\tools\appveyor.bat
 
+before_test:
+- ps: |
+    Write-Output "Getting and launching httpbin."
+    pip install httpbin
+    Start-Job -Name wx_httpbin { python -m httpbin.core > c:\projects\wxwidgets\httpbin.log }
+    curl http://127.0.0.1:5000/ip
+    $env:WX_TEST_WEBREQUEST_URL="http://127.0.0.1:5000"
+
 test_script: c:\projects\wxwidgets\build\tools\appveyor-test.bat
+
+after_test:
+- ps: |
+    Stop-Job -Name wx_httpbin
+    Write-Output "--- httpbin output ---"
+    Get-Content c:\projects\wxwidgets\httpbin.log
+    Write-Output "--- httpbin output end ---"

build/tools/appveyor-test.bat

@@ -1,12 +1,3 @@
-echo.
-echo --- Running httpbin...
-echo.
-
-pip install httpbin
-start /b python -m httpbin.core
-set WX_TEST_WEBREQUEST_URL=http://127.0.0.1:5000
-curl http://127.0.0.1:5000/ip
-
 echo.
 echo --- Running tests.
 echo.