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diff --git a/Tools/TestWebKitAPI/Tests/WTF/EnumTraits.cpp b/Tools/TestWebKitAPI/Tests/WTF/EnumTraits.cpp
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+++ b/Tools/TestWebKitAPI/Tests/WTF/EnumTraits.cpp
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+/*
+ * Copyright (C) 2016 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/EnumTraits.h>
+
+enum class TestEnum {
+    A,
+    B,
+    C,
+};
+
+namespace WTF {
+template<> struct EnumTraits<TestEnum> {
+    using values = EnumValues<TestEnum, TestEnum::A, TestEnum::B, TestEnum::C>;
+};
+}
+
+namespace TestWebKitAPI {
+
+static_assert(WTF::isValidEnum<TestEnum>(0), "");
+static_assert(!WTF::isValidEnum<TestEnum>(-1), "");
+static_assert(!WTF::isValidEnum<TestEnum>(3), "");
+
+TEST(WTF_EnumTraits, IsValidEnum)
+{
+    EXPECT_TRUE(isValidEnum<TestEnum>(0));
+    EXPECT_FALSE(isValidEnum<TestEnum>(-1));
+    EXPECT_FALSE(isValidEnum<TestEnum>(3));
+}
+
+}