attempt to run 'make check' tests on Appveyor

for mingw builds

appveyor.yml

@@ -1,3 +1,7 @@
+# Following tests are run _only_ on master branch
+# To reproduce these tests, it's possible to push into a branch `appveyorTest`
+# or a branch `visual*`, they will intentionnally trigger `master` tests
+
 -
   version: 1.0.{build}
   branches:
@@ -176,6 +180,11 @@
       fuzzer_VS2015_%PLATFORM%_Release.exe %FUZZERTEST%
     )
 
+
+# The following tests are for regular pushes
+# into `dev` or some feature branch
+# There run less tests, for shorter feedback loop
+
 -
   version: 1.0.{build}
   environment:
@@ -249,3 +258,11 @@
       COPY build\VS2010\bin\%PLATFORM%_%CONFIGURATION%\fuzzer.exe tests\fuzzer_VS2015_%PLATFORM%_%CONFIGURATION%.exe &&
       COPY build\VS2010\bin\%PLATFORM%_%CONFIGURATION%\*.exe tests\
     )
+
+
+  test_script:
+  - ECHO Testing %COMPILER% %PLATFORM% %CONFIGURATION%
+  - if [%HOST%]==[mingw] (
+      SET CC=%COMPILER%
+      make check
+    )