diff --git a/llvm/unittests/Support/TimerTest.cpp b/llvm/unittests/Support/TimerTest.cpp
new file mode 100644
index 0000000..ac7c52d
--- /dev/null
+++ b/llvm/unittests/Support/TimerTest.cpp
@@ -0,0 +1,49 @@
+//===- unittests/TimerTest.cpp - Timer tests ------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Timer.h"
+#include "gtest/gtest.h"
+#include <chrono>
+#include <thread>
+
+using namespace llvm;
+
+namespace {
+
+TEST(Timer, Additivity) {
+  Timer T1("T1");
+
+  EXPECT_TRUE(T1.isInitialized());
+
+  T1.startTimer();
+  T1.stopTimer();
+  auto TR1 = T1.getTotalTime();
+
+  T1.startTimer();
+  std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  T1.stopTimer();
+  auto TR2 = T1.getTotalTime();
+
+  EXPECT_TRUE(TR1 < TR2);
+}
+
+TEST(Timer, CheckIfTriggered) {
+  Timer T1("T1");
+
+  EXPECT_FALSE(T1.hasTriggered());
+  T1.startTimer();
+  EXPECT_TRUE(T1.hasTriggered());
+  T1.stopTimer();
+  EXPECT_TRUE(T1.hasTriggered());
+
+  T1.clear();
+  EXPECT_FALSE(T1.hasTriggered());
+}
+
+} // end anon namespace