GENERATOR_IS_MULTI_CONFIG: Use for multi-config checks in Tests

Tests/JavaExportImport/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 3.5)
+cmake_minimum_required (VERSION 3.9)
 project(JavaExportImport)
 if(NOT DEFINED CMake_TEST_NESTED_MAKE_PROGRAM AND NOT CMAKE_GENERATOR MATCHES "Visual Studio")
   set(CMake_TEST_NESTED_MAKE_PROGRAM "${CMAKE_MAKE_PROGRAM}")
@@ -17,7 +17,8 @@ set_property(
   PROPERTY SYMBOLIC 1
   )
 
-if(CMAKE_CONFIGURATION_TYPES)
+get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(_isMultiConfig)
   set(NESTED_CONFIG_TYPE -C "${CMAKE_CFG_INTDIR}")
 else()
   if(CMAKE_BUILD_TYPE)