diff --git a/unittests/ADT/StringRefTest.cpp b/unittests/ADT/StringRefTest.cpp
new file mode 100644
index 0000000..8a2c743
--- /dev/null
+++ b/unittests/ADT/StringRefTest.cpp
@@ -0,0 +1,59 @@
+//===- llvm/unittest/ADT/StringRefTest.cpp - StringRef unit tests ---------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+#include "llvm/ADT/StringRef.h"
+using namespace llvm;
+
+namespace {
+
+TEST(StringRefTest, Construction) {
+  EXPECT_TRUE(StringRef() == "");
+  EXPECT_TRUE(StringRef("hello") == "hello");
+  EXPECT_TRUE(StringRef("hello world", 5) == "hello");
+  EXPECT_TRUE(StringRef(std::string("hello")) == "hello");
+}
+
+TEST(StringRefTest, Iteration) {
+  StringRef S("hello");
+  const char *p = "hello";
+  for (const char *it = S.begin(), *ie = S.end(); it != ie; ++it, ++p)
+    EXPECT_TRUE(*p == *it);
+}
+
+TEST(StringRefTest, StringOps) {
+  const char *p = "hello";
+  EXPECT_EQ(p, StringRef(p, 0).data());
+  EXPECT_TRUE(StringRef().empty());
+  EXPECT_EQ((size_t) 5, StringRef("hello").size());
+  EXPECT_EQ(-1, StringRef("aab").compare("aad"));
+  EXPECT_EQ( 0, StringRef("aab").compare("aab"));
+  EXPECT_EQ( 1, StringRef("aab").compare("aaa"));
+  EXPECT_EQ(-1, StringRef("aab").compare("aabb"));
+  EXPECT_EQ( 1, StringRef("aab").compare("aa"));
+}
+
+TEST(StringRefTest, Operators) {
+  EXPECT_TRUE(StringRef() == "");
+  EXPECT_TRUE(StringRef("aab") < StringRef("aad"));
+  EXPECT_FALSE(StringRef("aab") < StringRef("aab"));
+  EXPECT_TRUE(StringRef("aab") <= StringRef("aab"));
+  EXPECT_FALSE(StringRef("aab") <= StringRef("aaa"));
+  EXPECT_TRUE(StringRef("aad") > StringRef("aab"));
+  EXPECT_FALSE(StringRef("aab") > StringRef("aab"));
+  EXPECT_TRUE(StringRef("aab") >= StringRef("aab"));
+  EXPECT_FALSE(StringRef("aaa") >= StringRef("aab"));
+  EXPECT_TRUE(StringRef("aab") == StringRef("aab"));
+  EXPECT_FALSE(StringRef("aab") == StringRef("aac"));
+  EXPECT_FALSE(StringRef("aab") != StringRef("aab"));
+  EXPECT_TRUE(StringRef("aab") != StringRef("aac"));
+  EXPECT_EQ('a', StringRef("aab")[1]);
+}
+
+} // end anonymous namespace