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diff --git a/Tools/TestWebKitAPI/Tests/WTF/Optional.cpp b/Tools/TestWebKitAPI/Tests/WTF/Optional.cpp
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+++ b/Tools/TestWebKitAPI/Tests/WTF/Optional.cpp
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+/*
+ * Copyright (C) 2014 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include <wtf/Optional.h>
+
+namespace TestWebKitAPI {
+
+TEST(WTF_Optional, Disengaged)
+{
+    {
+        Optional<int> optional;
+
+        EXPECT_FALSE(static_cast<bool>(optional));
+    }
+
+    {
+        Optional<int> optional { Nullopt };
+
+        EXPECT_FALSE(static_cast<bool>(optional));
+    }
+}
+
+TEST(WTF_Optional, Engaged)
+{
+    Optional<int> optional { 10 };
+
+    EXPECT_TRUE(static_cast<bool>(optional));
+    EXPECT_EQ(10, optional.value());
+}
+
+TEST(WTF_Optional, Destructor)
+{
+    static bool didCallDestructor = false;
+    struct A {
+        ~A()
+        {
+            EXPECT_FALSE(didCallDestructor);
+            didCallDestructor = true;
+        }
+    };
+
+    {
+        Optional<A> optional { InPlace };
+
+        EXPECT_TRUE(static_cast<bool>(optional));
+    }
+
+    EXPECT_TRUE(didCallDestructor);
+}
+
+TEST(WTF_Optional, Callback)
+{
+    bool called = false;
+    Optional<int> a;
+    int result = a.valueOrCompute([&] {
+        called = true;
+        return 300;
+    });
+    EXPECT_TRUE(called);
+    EXPECT_EQ(result, 300);
+
+    a = 250;
+    called = false;
+    result = a.valueOrCompute([&] {
+        called = true;
+        return 300;
+    });
+    EXPECT_FALSE(called);
+    EXPECT_EQ(result, 250);
+}
+
+TEST(WTF_Optional, Equality)
+{
+    Optional<int> unengaged1;
+    Optional<int> unengaged2;
+
+    Optional<int> engaged1 { 1 };
+    Optional<int> engaged2 { 2 };
+    Optional<int> engagedx2 { 2 };
+
+    EXPECT_TRUE(unengaged1 == unengaged2);
+    EXPECT_FALSE(engaged1 == engaged2);
+    EXPECT_FALSE(engaged1 == unengaged1);
+    EXPECT_TRUE(engaged2 == engagedx2);
+
+    EXPECT_TRUE(unengaged1 == Nullopt);
+    EXPECT_FALSE(engaged1 == Nullopt);
+    EXPECT_TRUE(Nullopt == unengaged1);
+    EXPECT_FALSE(Nullopt == engaged1);
+
+    EXPECT_TRUE(engaged1 == 1);
+    EXPECT_TRUE(1 == engaged1);
+    EXPECT_FALSE(unengaged1 == 1);
+    EXPECT_FALSE(1 == unengaged1);
+}
+
+TEST(WTF_Optional, Inequality)
+{
+    Optional<int> unengaged1;
+    Optional<int> unengaged2;
+
+    Optional<int> engaged1 { 1 };
+    Optional<int> engaged2 { 2 };
+    Optional<int> engagedx2 { 2 };
+
+    EXPECT_FALSE(unengaged1 != unengaged2);
+    EXPECT_TRUE(engaged1 != engaged2);
+    EXPECT_TRUE(engaged1 != unengaged1);
+    EXPECT_FALSE(engaged2 != engagedx2);
+
+    EXPECT_FALSE(unengaged1 != Nullopt);
+    EXPECT_TRUE(engaged1 != Nullopt);
+    EXPECT_FALSE(Nullopt != unengaged1);
+    EXPECT_TRUE(Nullopt != engaged1);
+
+    EXPECT_FALSE(engaged1 != 1);
+    EXPECT_TRUE(engaged1 != 2);
+    EXPECT_FALSE(1 != engaged1);
+    EXPECT_TRUE(2 != engaged1);
+
+    EXPECT_TRUE(unengaged1 != 1);
+    EXPECT_TRUE(1 != unengaged1);
+}
+
+
+} // namespace TestWebKitAPI