ENH: Enable test on windows

Source/CMakeLists.txt

@@ -361,7 +361,7 @@ IF(BUILD_TESTING)
       objc++)
   ENDIF (APPLE)
 
-  IF (CMAKE_WXWINDOWS_WXCONFIG_EXECUTABLE)
+  IF (CMAKE_WXWINDOWS_WXCONFIG_EXECUTABLE OR WXWINDOWS_INCLUDE_DIR)
     # Will be set if the wxwindows gui is on
     ADD_TEST(UseWX ${EXECUTABLE_OUTPUT_PATH}/cmaketest 
       ${CMake_SOURCE_DIR}/Tests/UseWX
@@ -370,7 +370,7 @@ IF(BUILD_TESTING)
       ${CMake_BINARY_DIR}/Tests/UseWX
       UsewxWindows
       CMAKE_ARGS -DCMAKE_WXWINDOWS_WXCONFIG_EXECUTABLE:FILEPATH=${CMAKE_WXWINDOWS_WXCONFIG_EXECUTABLE})
-  ENDIF (CMAKE_WXWINDOWS_WXCONFIG_EXECUTABLE)
+  ENDIF (CMAKE_WXWINDOWS_WXCONFIG_EXECUTABLE OR WXWINDOWS_INCLUDE_DIR)
 
   IF(UNIX)
     IF("x${CMAKE_INSTALL_PREFIX}" MATCHES "^x${CMake_BINARY_DIR}/Tests/TestInstall/Prefix$")