appveyor: Enable .fex testing in build configuration

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

appveyor.yml

@@ -17,7 +17,10 @@ build_script:
   - cmd: mingw32-make LIBUSB_CFLAGS="-I libusb/include/libusb-1.0" LIBUSB_LIBS="-L libusb/MinGW32/dll -lusb-1.0"
   - cmd: mingw32-make misc
 
-after_build:
+test_script:
+  - cmd: mingw32-make -C tests/ check_all_fex
+
+after_test:
   - cmd: .appveyor/package-artifacts.cmd
 
 artifacts: