FIXED use the equivalent of /dev/null on windows

On gitlab runner writing in C:\Windows is possible (gitlab runner seems to be run with administrator priviledge!)

tutorials/applications/testlogger/CMakeLists.txt

@@ -28,8 +28,8 @@ camitk_add_test(EXECUTABLE_ARGS "-error /test"
 
 # should pass because invoking testlogger with an inexistent and impossible to create directory 
 # results in printing an "Argument error" message (and exit failure)
-if(WIN32) # this test fails on windows7 VM due to missing tweek for -debug
-    set(BAD_DIRECTORY "C:/Windows/test")
+if(WIN32)
+    set(BAD_DIRECTORY "C:/NUL/test")    # NUL works a bit like /dev/null see https://docs.microsoft.com/en-us/previous-versions/windows/embedded/aa939249(v=winembedded.5)
 else()
     set(BAD_DIRECTORY "/dev/null/test") # works on VM, docker and host
 endif()
@@ -43,6 +43,7 @@ else()
     set(LOG_OUTPUT_FILE log-default-linux.log)
 endif()
     
+# Last test should have the same output as log-default-*.log depending on the OS
 camitk_add_test(EXECUTABLE_ARGS "-d ${CMAKE_CURRENT_BINARY_DIR}/testlogger"
                 PASS_FILE ${CMAKE_CURRENT_SOURCE_DIR}/${LOG_OUTPUT_FILE}
                 PROJECT_NAME ${APPLICATION_TARGET_NAME} 

tutorials/applications/testloggercrash/CMakeLists.txt

@@ -2,7 +2,6 @@
 # add_definitions(-DCAMITK_DISABLE_LOG)
 camitk_application()
 
-
 #----------
 # Testing
 #----------
@@ -29,7 +28,7 @@ camitk_add_test(EXECUTABLE_ARGS "-error /test"
 # should pass because invoking testlogger with an inexistent and impossible to create directory 
 # results in printing an "Argument error" message (and exit failure)
 if(WIN32) # this test fails on windows7 VM due to missing tweek for -debug
-    set(BAD_DIRECTORY "C:/Windows/test")
+    set(BAD_DIRECTORY "C:/NUL/test")
 else()
     set(BAD_DIRECTORY "/dev/null/test") # fails systematically on VM, docker and host 
 endif()
@@ -37,6 +36,7 @@ camitk_add_test(EXECUTABLE_ARGS "-d ${BAD_DIRECTORY}"
                 PASS_REGULAR_EXPRESSION "Argument errors: "
                 PROJECT_NAME ${APPLICATION_TARGET_NAME} TEST_SUFFIX "-")
 
+# Last test should have the same output as log-default.log
 camitk_add_test(EXECUTABLE_ARGS "-d ${CMAKE_CURRENT_BINARY_DIR}/testlogger"
                 PASS_FILE ${CMAKE_CURRENT_SOURCE_DIR}/log-default.log 
                 PROJECT_NAME ${APPLICATION_TARGET_NAME}