--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/unittests/Support/ProcessTest.cpp	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,70 @@
+//===- unittest/Support/ProcessTest.cpp -----------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Process.h"
+#include "gtest/gtest.h"
+
+#ifdef LLVM_ON_WIN32
+#include "windows.h"
+#endif
+
+namespace {
+
+using namespace llvm;
+using namespace sys;
+
+TEST(ProcessTest, SelfProcess) {
+  EXPECT_TRUE(process::get_self());
+  EXPECT_EQ(process::get_self(), process::get_self());
+
+#if defined(LLVM_ON_UNIX)
+  EXPECT_EQ(getpid(), process::get_self()->get_id());
+#elif defined(LLVM_ON_WIN32)
+  EXPECT_EQ(GetCurrentProcessId(), process::get_self()->get_id());
+#endif
+
+  EXPECT_LT(1u, process::get_self()->page_size());
+
+  EXPECT_LT(TimeValue::MinTime, process::get_self()->get_user_time());
+  EXPECT_GT(TimeValue::MaxTime, process::get_self()->get_user_time());
+  EXPECT_LT(TimeValue::MinTime, process::get_self()->get_system_time());
+  EXPECT_GT(TimeValue::MaxTime, process::get_self()->get_system_time());
+  EXPECT_LT(TimeValue::MinTime, process::get_self()->get_wall_time());
+  EXPECT_GT(TimeValue::MaxTime, process::get_self()->get_wall_time());
+}
+
+#ifdef _MSC_VER
+#define setenv(name, var, ignore) _putenv_s(name, var)
+#endif
+
+#if HAVE_SETENV || _MSC_VER
+TEST(ProcessTest, Basic) {
+  setenv("__LLVM_TEST_ENVIRON_VAR__", "abc", true);
+  Optional<std::string> val(Process::GetEnv("__LLVM_TEST_ENVIRON_VAR__"));
+  EXPECT_TRUE(val.hasValue());
+  EXPECT_STREQ("abc", val->c_str());
+}
+
+TEST(ProcessTest, None) {
+  Optional<std::string> val(
+      Process::GetEnv("__LLVM_TEST_ENVIRON_NO_SUCH_VAR__"));
+  EXPECT_FALSE(val.hasValue());
+}
+#endif
+
+#ifdef LLVM_ON_WIN32
+TEST(ProcessTest, Wchar) {
+  SetEnvironmentVariableW(L"__LLVM_TEST_ENVIRON_VAR__", L"abcdefghijklmnopqrs");
+  Optional<std::string> val(Process::GetEnv("__LLVM_TEST_ENVIRON_VAR__"));
+  EXPECT_TRUE(val.hasValue());
+  EXPECT_STREQ("abcdefghijklmnopqrs", val->c_str());
+}
+#endif
+
+} // end anonymous namespace