Try to make appveryor more verbose during tests.

ObiWahn · ObiWahn · commit 104dcd7608b3 · 2021-10-21T21:22:37.000+02:00
diff --git a/.appveyor.yml b/.appveyor.yml
@@ -35,4 +35,4 @@ build_script:
   - cmake --build . --config "%CONFIGURATION%"
 
 test_script:
-  - ctest -C "%CONFIGURATION%" --output-on-failure
+  - ctest -C "%CONFIGURATION%" --rerun-failed --output-on-failure -VV
