Enable util_tests.cpp on Windows

Author: aobolensk

modules/core/util/func_tests/util_tests.cpp

@@ -6,22 +6,28 @@
 
 #include "core/util/include/util.hpp"
 
+#ifdef _WIN32
+#include <Windows.h>
+inline int unsetenv(const char* name) { return SetEnvironmentVariableA(name, NULL) ? 0 : -1; }
+inline int setenv(const char* name, const char* value, int overwrite) {
+  return SetEnvironmentVariableA(name, value) ? 0 : -1;
+}
+#else
+extern "C" int unsetenv(const char* name);
+extern "C" int setenv(const char* name, const char* value, int overwrite);
+#endif
+
 TEST(util_tests, check_unset_env) {
-#ifndef _WIN32
   int save_var = ppc::util::GetPPCNumThreads();
 
   unsetenv("OMP_NUM_THREADS");  // NOLINT(misc-include-cleaner)
 
   EXPECT_EQ(ppc::util::GetPPCNumThreads(), 1);
 
   setenv("OMP_NUM_THREADS", std::to_string(save_var).c_str(), 1);  // NOLINT(misc-include-cleaner)
-#else
-  GTEST_SKIP();
-#endif
 }
 
 TEST(util_tests, check_set_env) {
-#ifndef _WIN32
   int save_var = ppc::util::GetPPCNumThreads();
 
   const int num_threads = static_cast<int>(std::thread::hardware_concurrency());
@@ -30,7 +36,4 @@ TEST(util_tests, check_set_env) {
   EXPECT_EQ(ppc::util::GetPPCNumThreads(), num_threads);
 
   setenv("OMP_NUM_THREADS", std::to_string(save_var).c_str(), 1);  // NOLINT(misc-include-cleaner)
-#else
-  GTEST_SKIP();
-#endif
 }