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diff --git a/Utilities/cmcppdap/src/optional_test.cpp b/Utilities/cmcppdap/src/optional_test.cpp
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+++ b/Utilities/cmcppdap/src/optional_test.cpp
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+// Copyright 2019 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "dap/optional.h"
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+#include <string>
+
+TEST(Optional, EmptyConstruct) {
+  dap::optional<std::string> opt;
+  ASSERT_FALSE(opt);
+  ASSERT_FALSE(opt.has_value());
+}
+
+TEST(Optional, ValueConstruct) {
+  dap::optional<int> opt(10);
+  ASSERT_TRUE(opt);
+  ASSERT_TRUE(opt.has_value());
+  ASSERT_EQ(opt.value(), 10);
+}
+
+TEST(Optional, CopyConstruct) {
+  dap::optional<std::string> a("meow");
+  dap::optional<std::string> b(a);
+  ASSERT_EQ(a, b);
+  ASSERT_EQ(a.value(), "meow");
+  ASSERT_EQ(b.value(), "meow");
+}
+
+TEST(Optional, CopyCastConstruct) {
+  dap::optional<int> a(10);
+  dap::optional<uint16_t> b(a);
+  ASSERT_EQ(a, b);
+  ASSERT_EQ(b.value(), (uint16_t)10);
+}
+
+TEST(Optional, MoveConstruct) {
+  dap::optional<std::string> a("meow");
+  dap::optional<std::string> b(std::move(a));
+  ASSERT_EQ(b.value(), "meow");
+}
+
+TEST(Optional, MoveCastConstruct) {
+  dap::optional<int> a(10);
+  dap::optional<uint16_t> b(std::move(a));
+  ASSERT_EQ(b.value(), (uint16_t)10);
+}
+
+TEST(Optional, AssignValue) {
+  dap::optional<std::string> a;
+  std::string b = "meow";
+  a = b;
+  ASSERT_EQ(a.value(), "meow");
+  ASSERT_EQ(b, "meow");
+}
+
+TEST(Optional, AssignOptional) {
+  dap::optional<std::string> a;
+  dap::optional<std::string> b("meow");
+  a = b;
+  ASSERT_EQ(a.value(), "meow");
+  ASSERT_EQ(b.value(), "meow");
+}
+
+TEST(Optional, MoveAssignOptional) {
+  dap::optional<std::string> a;
+  dap::optional<std::string> b("meow");
+  a = std::move(b);
+  ASSERT_EQ(a.value(), "meow");
+}
+
+TEST(Optional, StarDeref) {
+  dap::optional<std::string> a("meow");
+  ASSERT_EQ(*a, "meow");
+}
+
+TEST(Optional, StarDerefConst) {
+  const dap::optional<std::string> a("meow");
+  ASSERT_EQ(*a, "meow");
+}
+
+TEST(Optional, ArrowDeref) {
+  struct S {
+    int i;
+  };
+  dap::optional<S> a(S{10});
+  ASSERT_EQ(a->i, 10);
+}
+
+TEST(Optional, ArrowDerefConst) {
+  struct S {
+    int i;
+  };
+  const dap::optional<S> a(S{10});
+  ASSERT_EQ(a->i, 10);
+}
+
+TEST(Optional, Value) {
+  const dap::optional<std::string> a("meow");
+  ASSERT_EQ(a.value(), "meow");
+}
+
+TEST(Optional, ValueDefault) {
+  const dap::optional<std::string> a;
+  const dap::optional<std::string> b("woof");
+  ASSERT_EQ(a.value("meow"), "meow");
+  ASSERT_EQ(b.value("meow"), "woof");
+}
+
+TEST(Optional, CompareLT) {
+  ASSERT_FALSE(dap::optional<int>(5) < dap::optional<int>(3));
+  ASSERT_FALSE(dap::optional<int>(5) < dap::optional<int>(5));
+  ASSERT_TRUE(dap::optional<int>(5) < dap::optional<int>(10));
+  ASSERT_TRUE(dap::optional<int>() < dap::optional<int>(10));
+  ASSERT_FALSE(dap::optional<int>() < dap::optional<int>());
+}
+
+TEST(Optional, CompareLE) {
+  ASSERT_FALSE(dap::optional<int>(5) <= dap::optional<int>(3));
+  ASSERT_TRUE(dap::optional<int>(5) <= dap::optional<int>(5));
+  ASSERT_TRUE(dap::optional<int>(5) <= dap::optional<int>(10));
+  ASSERT_TRUE(dap::optional<int>() <= dap::optional<int>(10));
+  ASSERT_TRUE(dap::optional<int>() <= dap::optional<int>());
+}
+
+TEST(Optional, CompareGT) {
+  ASSERT_TRUE(dap::optional<int>(5) > dap::optional<int>(3));
+  ASSERT_FALSE(dap::optional<int>(5) > dap::optional<int>(5));
+  ASSERT_FALSE(dap::optional<int>(5) > dap::optional<int>(10));
+  ASSERT_FALSE(dap::optional<int>() > dap::optional<int>(10));
+  ASSERT_FALSE(dap::optional<int>() > dap::optional<int>());
+}
+
+TEST(Optional, CompareGE) {
+  ASSERT_TRUE(dap::optional<int>(5) >= dap::optional<int>(3));
+  ASSERT_TRUE(dap::optional<int>(5) >= dap::optional<int>(5));
+  ASSERT_FALSE(dap::optional<int>(5) >= dap::optional<int>(10));
+  ASSERT_FALSE(dap::optional<int>() >= dap::optional<int>(10));
+  ASSERT_TRUE(dap::optional<int>() >= dap::optional<int>());
+}
+
+TEST(Optional, CompareEQ) {
+  ASSERT_FALSE(dap::optional<int>(5) == dap::optional<int>(3));
+  ASSERT_TRUE(dap::optional<int>(5) == dap::optional<int>(5));
+  ASSERT_FALSE(dap::optional<int>(5) == dap::optional<int>(10));
+  ASSERT_FALSE(dap::optional<int>() == dap::optional<int>(10));
+  ASSERT_TRUE(dap::optional<int>() == dap::optional<int>());
+}
+
+TEST(Optional, CompareNEQ) {
+  ASSERT_TRUE(dap::optional<int>(5) != dap::optional<int>(3));
+  ASSERT_FALSE(dap::optional<int>(5) != dap::optional<int>(5));
+  ASSERT_TRUE(dap::optional<int>(5) != dap::optional<int>(10));
+  ASSERT_TRUE(dap::optional<int>() != dap::optional<int>(10));
+  ASSERT_FALSE(dap::optional<int>() != dap::optional<int>());
+}