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diff --git a/Tools/TestWebKitAPI/Tests/WTF/StringOperators.cpp b/Tools/TestWebKitAPI/Tests/WTF/StringOperators.cpp
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+++ b/Tools/TestWebKitAPI/Tests/WTF/StringOperators.cpp
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2011 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"
+
+#define WTF_STRINGTYPEADAPTER_COPIED_WTF_STRING() (++wtfStringCopyCount)
+
+static int wtfStringCopyCount;
+
+#include <wtf/text/WTFString.h>
+
+namespace TestWebKitAPI {
+
+#define EXPECT_N_WTF_STRING_COPIES(count, expr) \
+    do { \
+        wtfStringCopyCount = 0; \
+        String __testString = expr; \
+        (void)__testString; \
+        EXPECT_EQ(count, wtfStringCopyCount) << #expr; \
+    } while (false)
+
+TEST(WTF, StringOperators)
+{
+    String string("String");
+    AtomicString atomicString("AtomicString");
+
+    EXPECT_EQ(0, wtfStringCopyCount);
+
+    EXPECT_N_WTF_STRING_COPIES(2, string + string);
+    EXPECT_N_WTF_STRING_COPIES(2, string + atomicString);
+    EXPECT_N_WTF_STRING_COPIES(2, atomicString + string);
+    EXPECT_N_WTF_STRING_COPIES(2, atomicString + atomicString);
+
+    EXPECT_N_WTF_STRING_COPIES(1, "C string" + string);
+    EXPECT_N_WTF_STRING_COPIES(1, string + "C string");
+    EXPECT_N_WTF_STRING_COPIES(1, "C string" + atomicString);
+    EXPECT_N_WTF_STRING_COPIES(1, atomicString + "C string");
+
+    EXPECT_N_WTF_STRING_COPIES(2, "C string" + string + "C string" + string);
+    EXPECT_N_WTF_STRING_COPIES(2, "C string" + (string + "C string" + string));
+    EXPECT_N_WTF_STRING_COPIES(2, ("C string" + string) + ("C string" + string));
+    EXPECT_N_WTF_STRING_COPIES(2, string + "C string" + string + "C string");
+    EXPECT_N_WTF_STRING_COPIES(2, string + ("C string" + string + "C string"));
+    EXPECT_N_WTF_STRING_COPIES(2, (string + "C string") + (string + "C string"));
+
+    EXPECT_N_WTF_STRING_COPIES(2, "C string" + atomicString + "C string" + atomicString);
+    EXPECT_N_WTF_STRING_COPIES(2, "C string" + (atomicString + "C string" + atomicString));
+    EXPECT_N_WTF_STRING_COPIES(2, ("C string" + atomicString) + ("C string" + atomicString));
+    EXPECT_N_WTF_STRING_COPIES(2, atomicString + "C string" + atomicString + "C string");
+    EXPECT_N_WTF_STRING_COPIES(2, atomicString + ("C string" + atomicString + "C string"));
+    EXPECT_N_WTF_STRING_COPIES(2, (atomicString + "C string") + (atomicString + "C string"));
+
+    EXPECT_N_WTF_STRING_COPIES(2, "C string" + string + "C string" + atomicString);
+    EXPECT_N_WTF_STRING_COPIES(2, "C string" + (string + "C string" + atomicString));
+    EXPECT_N_WTF_STRING_COPIES(2, ("C string" + string) + ("C string" + atomicString));
+    EXPECT_N_WTF_STRING_COPIES(2, string + "C string" + atomicString + "C string");
+    EXPECT_N_WTF_STRING_COPIES(2, string + ("C string" + atomicString + "C string"));
+    EXPECT_N_WTF_STRING_COPIES(2, (string + "C string") + (atomicString + "C string"));
+
+    EXPECT_N_WTF_STRING_COPIES(2, "C string" + atomicString + "C string" + string);
+    EXPECT_N_WTF_STRING_COPIES(2, "C string" + (atomicString + "C string" + string));
+    EXPECT_N_WTF_STRING_COPIES(2, ("C string" + atomicString) + ("C string" + string));
+    EXPECT_N_WTF_STRING_COPIES(2, atomicString + "C string" + string + "C string");
+    EXPECT_N_WTF_STRING_COPIES(2, atomicString + ("C string" + string + "C string"));
+    EXPECT_N_WTF_STRING_COPIES(2, (atomicString + "C string") + (string + "C string"));
+
+#if COMPILER(MSVC)
+    EXPECT_N_WTF_STRING_COPIES(1, L"wide string" + string);
+    EXPECT_N_WTF_STRING_COPIES(1, string + L"wide string");
+    EXPECT_N_WTF_STRING_COPIES(1, L"wide string" + atomicString);
+    EXPECT_N_WTF_STRING_COPIES(1, atomicString + L"wide string");
+
+    EXPECT_N_WTF_STRING_COPIES(2, L"wide string" + string + L"wide string" + string);
+    EXPECT_N_WTF_STRING_COPIES(2, L"wide string" + (string + L"wide string" + string));
+    EXPECT_N_WTF_STRING_COPIES(2, (L"wide string" + string) + (L"wide string" + string));
+    EXPECT_N_WTF_STRING_COPIES(2, string + L"wide string" + string + L"wide string");
+    EXPECT_N_WTF_STRING_COPIES(2, string + (L"wide string" + string + L"wide string"));
+    EXPECT_N_WTF_STRING_COPIES(2, (string + L"wide string") + (string + L"wide string"));
+
+    EXPECT_N_WTF_STRING_COPIES(2, L"wide string" + atomicString + L"wide string" + atomicString);
+    EXPECT_N_WTF_STRING_COPIES(2, L"wide string" + (atomicString + L"wide string" + atomicString));
+    EXPECT_N_WTF_STRING_COPIES(2, (L"wide string" + atomicString) + (L"wide string" + atomicString));
+    EXPECT_N_WTF_STRING_COPIES(2, atomicString + L"wide string" + atomicString + L"wide string");
+    EXPECT_N_WTF_STRING_COPIES(2, atomicString + (L"wide string" + atomicString + L"wide string"));
+    EXPECT_N_WTF_STRING_COPIES(2, (atomicString + L"wide string") + (atomicString + L"wide string"));
+
+    EXPECT_N_WTF_STRING_COPIES(2, L"wide string" + string + L"wide string" + atomicString);
+    EXPECT_N_WTF_STRING_COPIES(2, L"wide string" + (string + L"wide string" + atomicString));
+    EXPECT_N_WTF_STRING_COPIES(2, (L"wide string" + string) + (L"wide string" + atomicString));
+    EXPECT_N_WTF_STRING_COPIES(2, string + L"wide string" + atomicString + L"wide string");
+    EXPECT_N_WTF_STRING_COPIES(2, string + (L"wide string" + atomicString + L"wide string"));
+    EXPECT_N_WTF_STRING_COPIES(2, (string + L"wide string") + (atomicString + L"wide string"));
+
+    EXPECT_N_WTF_STRING_COPIES(2, L"wide string" + atomicString + L"wide string" + string);
+    EXPECT_N_WTF_STRING_COPIES(2, L"wide string" + (atomicString + L"wide string" + string));
+    EXPECT_N_WTF_STRING_COPIES(2, (L"wide string" + atomicString) + (L"wide string" + string));
+    EXPECT_N_WTF_STRING_COPIES(2, atomicString + L"wide string" + string + L"wide string");
+    EXPECT_N_WTF_STRING_COPIES(2, atomicString + (L"wide string" + string + L"wide string"));
+    EXPECT_N_WTF_STRING_COPIES(2, (atomicString + L"wide string") + (string + L"wide string"));
+#endif
+}
+
+} // namespace TestWebKitAPI