Index: unittests/Utility/CMakeLists.txt
===================================================================
--- unittests/Utility/CMakeLists.txt
+++ unittests/Utility/CMakeLists.txt
@@ -20,6 +20,7 @@
   UriParserTest.cpp
   UUIDTest.cpp
   VASprintfTest.cpp
+  VMRangeTest.cpp
 
   LINK_LIBS
       lldbUtility
Index: unittests/Utility/VMRangeTest.cpp
===================================================================
--- /dev/null
+++ unittests/Utility/VMRangeTest.cpp
@@ -0,0 +1,125 @@
+//===-- VMRangeTest.cpp -----------------------------------------*- C++ -*-===//
+//
+//                     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 "lldb/Utility/VMRange.h"
+using namespace lldb_private;
+
+TEST(VMRange, IsValid) {
+  VMRange range;
+  ASSERT_FALSE(range.IsValid());
+
+  range.Reset(0x1, 0x100);
+  ASSERT_TRUE(range.IsValid());
+
+  range.Reset(0x1, 0x1);
+  ASSERT_FALSE(range.IsValid());
+}
+
+TEST(VMRange, Clear) {
+  VMRange range(0x100, 0x200);
+  ASSERT_FALSE(VMRange() == range);
+  range.Clear();
+  ASSERT_TRUE(VMRange() == range);
+}
+
+TEST(VMRange, Comparison) {
+  VMRange range1(0x100, 0x200);
+  VMRange range2(0x100, 0x200);
+  ASSERT_FALSE(range1 != range2);
+  range2.Clear();
+  ASSERT_TRUE(range1 != range2);
+}
+
+TEST(VMRange, Reset) {
+  VMRange range(0x100, 0x200);
+  ASSERT_FALSE(VMRange(0x200, 0x200) == range);
+  range.Reset(0x200, 0x200);
+  ASSERT_TRUE(VMRange(0x200, 0x200) == range);
+}
+
+TEST(VMRange, SetEndAddress) {
+  VMRange range(0x100, 0x200);
+
+  range.SetEndAddress(0xFF);
+  ASSERT_EQ(0U, range.GetByteSize());
+  ASSERT_FALSE(range.IsValid());
+
+  range.SetEndAddress(0x101);
+  ASSERT_EQ(1U, range.GetByteSize());
+  ASSERT_TRUE(range.IsValid());
+}
+
+TEST(VMRange, ContainsAddr) {
+  VMRange range(0x100, 0x200);
+
+  ASSERT_FALSE(range.Contains(0x00));
+  ASSERT_FALSE(range.Contains(0xFE));
+  ASSERT_FALSE(range.Contains(0xFF));
+  ASSERT_TRUE(range.Contains(0x100));
+  ASSERT_TRUE(range.Contains(0x101));
+  ASSERT_TRUE(range.Contains(0x1FF));
+  ASSERT_FALSE(range.Contains(0x200));
+  ASSERT_FALSE(range.Contains(0x201));
+  ASSERT_FALSE(range.Contains(0xFFF));
+}
+
+TEST(VMRange, ContainsRange) {
+  VMRange range(0x100, 0x200);
+
+  ASSERT_FALSE(range.Contains(VMRange(0x0, 0x0)));
+
+  ASSERT_FALSE(range.Contains(VMRange(0x0, 0x100)));
+  ASSERT_FALSE(range.Contains(VMRange(0x0, 0x101)));
+  ASSERT_TRUE(range.Contains(VMRange(0x100, 0x105)));
+  ASSERT_TRUE(range.Contains(VMRange(0x101, 0x105)));
+  ASSERT_TRUE(range.Contains(VMRange(0x100, 0x1FF)));
+  ASSERT_TRUE(range.Contains(VMRange(0x105, 0x200)));
+  ASSERT_FALSE(range.Contains(VMRange(0x105, 0x208)));
+  ASSERT_FALSE(range.Contains(VMRange(0x200, 0x201)));
+
+  range.Clear();
+  ASSERT_FALSE(range.Contains(VMRange(0x0, 0x0)));
+}
+
+TEST(VMRange, Ordering) {
+  VMRange range1(0x44, 0x200);
+  VMRange range2(0x100, 0x1FF);
+  VMRange range3(0x100, 0x200);
+  VMRange range4(0xFFF, 0x100);
+
+  ASSERT_TRUE(range1 <= range1);
+  ASSERT_TRUE(range1 >= range1);
+
+  ASSERT_TRUE(range1 < range2);
+  ASSERT_TRUE(range2 < range3);
+  ASSERT_TRUE(range3 < range4);
+
+  ASSERT_FALSE(range1 > range2);
+  ASSERT_FALSE(range2 > range3);
+  ASSERT_FALSE(range3 > range4);
+}
+
+TEST(VMRange, CollectionContains) {
+  VMRange::collection collection = {VMRange(0x100, 0x105),
+                                    VMRange(0x108, 0x110)};
+
+  ASSERT_FALSE(VMRange::ContainsValue(collection, 0xFF));
+  ASSERT_TRUE(VMRange::ContainsValue(collection, 0x100));
+  ASSERT_FALSE(VMRange::ContainsValue(collection, 0x105));
+  ASSERT_TRUE(VMRange::ContainsValue(collection, 0x109));
+
+  ASSERT_TRUE(VMRange::ContainsRange(collection, VMRange(0x100, 0x104)));
+  ASSERT_TRUE(VMRange::ContainsRange(collection, VMRange(0x108, 0x100)));
+  ASSERT_FALSE(VMRange::ContainsRange(collection, VMRange(0xFF, 0x100)));
+
+  // TODO: Implement and test ContainsRange with values that span multiple
+  // ranges in the collection.
+}