diff --git a/llvm/unittests/ADT/ArrayRefTest.cpp b/llvm/unittests/ADT/ArrayRefTest.cpp
index 293afc6..83a012d 100644
--- a/llvm/unittests/ADT/ArrayRefTest.cpp
+++ b/llvm/unittests/ADT/ArrayRefTest.cpp
@@ -36,5 +36,27 @@
   EXPECT_TRUE(AR1.drop_back().equals(AR2));
 }
 
+TEST(ArrayRefTest, Equals) {
+  static const int A1[] = {1, 2, 3, 4, 5, 6, 7, 8};
+  ArrayRef<int> AR1(A1);
+  EXPECT_TRUE(AR1.equals(1, 2, 3, 4, 5, 6, 7, 8));
+  EXPECT_FALSE(AR1.equals(8, 1, 2, 4, 5, 6, 6, 7));
+  EXPECT_FALSE(AR1.equals(2, 4, 5, 6, 6, 7, 8, 1));
+  EXPECT_FALSE(AR1.equals(0, 1, 2, 4, 5, 6, 6, 7));
+  EXPECT_FALSE(AR1.equals(1, 2, 42, 4, 5, 6, 7, 8));
+  EXPECT_FALSE(AR1.equals(42, 2, 3, 4, 5, 6, 7, 8));
+  EXPECT_FALSE(AR1.equals(1, 2, 3, 4, 5, 6, 7, 42));
+  EXPECT_FALSE(AR1.equals(1, 2, 3, 4, 5, 6, 7));
+  EXPECT_FALSE(AR1.equals(1, 2, 3, 4, 5, 6, 7, 8, 9));
+
+  ArrayRef<int> AR1a = AR1.drop_back();
+  EXPECT_TRUE(AR1a.equals(1, 2, 3, 4, 5, 6, 7));
+  EXPECT_FALSE(AR1a.equals(1, 2, 3, 4, 5, 6, 7, 8));
+
+  ArrayRef<int> AR1b = AR1a.slice(2, 4);
+  EXPECT_TRUE(AR1b.equals(3, 4, 5, 6));
+  EXPECT_FALSE(AR1b.equals(2, 3, 4, 5, 6));
+  EXPECT_FALSE(AR1b.equals(3, 4, 5, 6, 7));
+}
 
 } // end anonymous namespace