omit `valgrind` tests for `Visual Studio` builds

test/unittest/CMakeLists.txt

@@ -21,12 +21,15 @@ add_test(NAME unittest
     COMMAND ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/unittest
     WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/bin)
 
-add_test(NAME valgrind_unittest
-    COMMAND valgrind --leak-check=full --error-exitcode=1 ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/unittest
-    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/bin)
+if(NOT MSVC)
+    add_test(NAME valgrind_unittest
+        COMMAND valgrind --leak-check=full --error-exitcode=1 ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/unittest
+        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/bin)
+
+    if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+        add_test(NAME symbol_check
+        COMMAND sh -c "objdump -t -C libnamespacetest.a | grep rapidjson ; test $? -ne 0"
+        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+    endif(CMAKE_BUILD_TYPE STREQUAL "Debug")
 
-IF((NOT MSVC) AND (CMAKE_BUILD_TYPE STREQUAL "Debug"))
-add_test(NAME symbol_check
-    COMMAND sh -c "objdump -t -C libnamespacetest.a | grep rapidjson ; test $? -ne 0"
-    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-ENDIF()
+endif(NOT MSVC)