diff --git a/unittests/ADT/CMakeLists.txt b/unittests/ADT/CMakeLists.txt
index 8f0d176c3578521368bd8751ad36eb3c894bdaf3..905d9b63399c68012c95d49babdbe4d12ae16250 100644
--- a/unittests/ADT/CMakeLists.txt
+++ b/unittests/ADT/CMakeLists.txt
@@ -51,6 +51,7 @@ add_llvm_unittest(ADTTests
   SetVectorTest.cpp
   SimpleIListTest.cpp
   SmallPtrSetTest.cpp
+  SmallSetTest.cpp
   SmallStringTest.cpp
   SmallVectorTest.cpp
   SparseBitVectorTest.cpp
diff --git a/unittests/ADT/SmallSetTest.cpp b/unittests/ADT/SmallSetTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..7608e65674ee207f51a326ad0f3d54da40fdc36b
--- /dev/null
+++ b/unittests/ADT/SmallSetTest.cpp
@@ -0,0 +1,70 @@
+//===- llvm/unittest/ADT/SmallSetTest.cpp ------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// SmallSet unit tests.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/SmallSet.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+TEST(SmallSetTest, Insert) {
+
+  SmallSet<int, 4> s1;
+
+  for (int i = 0; i < 4; i++)
+    s1.insert(i);
+
+  for (int i = 0; i < 4; i++)
+    s1.insert(i);
+
+  EXPECT_EQ(4u, s1.size());
+
+  for (int i = 0; i < 4; i++)
+    EXPECT_EQ(1u, s1.count(i));
+
+  EXPECT_EQ(0u, s1.count(4));
+}
+
+TEST(SmallSetTest, Grow) {
+  SmallSet<int, 4> s1;
+
+  for (int i = 0; i < 8; i++)
+    s1.insert(i);
+
+  EXPECT_EQ(8u, s1.size());
+
+  for (int i = 0; i < 8; i++)
+    EXPECT_EQ(1u, s1.count(i));
+
+  EXPECT_EQ(0u, s1.count(8));
+}
+
+TEST(SmallSetTest, Erase) {
+  SmallSet<int, 4> s1;
+
+  for (int i = 0; i < 8; i++)
+    s1.insert(i);
+
+  EXPECT_EQ(8u, s1.size());
+
+  // Remove elements one by one and check if all other elements are still there.
+  for (int i = 0; i < 8; i++) {
+    EXPECT_EQ(1u, s1.count(i));
+    EXPECT_TRUE(s1.erase(i));
+    EXPECT_EQ(0u, s1.count(i));
+    EXPECT_EQ(8u - i - 1, s1.size());
+    for (int j = i + 1; j < 8; j++)
+      EXPECT_EQ(1u, s1.count(j));
+  }
+
+  EXPECT_EQ(0u, s1.count(8));
+}