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diff --git a/Tools/TestWebKitAPI/JavaScriptTest.cpp b/Tools/TestWebKitAPI/JavaScriptTest.cpp
new file mode 100644
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+++ b/Tools/TestWebKitAPI/JavaScriptTest.cpp
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+/*
+ * 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"
+
+#if WK_HAVE_C_SPI
+
+#include "JavaScriptTest.h"
+
+#include "PlatformUtilities.h"
+#include "Test.h"
+#include <JavaScriptCore/JSContextRef.h>
+#include <JavaScriptCore/JSRetainPtr.h>
+#include <WebKit/WKRetainPtr.h>
+#include <WebKit/WKSerializedScriptValue.h>
+#include <wtf/StdLibExtras.h>
+
+namespace TestWebKitAPI {
+
+struct JavaScriptCallbackContext {
+    JavaScriptCallbackContext() : didFinish(false) { }
+
+    bool didFinish;
+    JSRetainPtr<JSStringRef> actualString;
+};
+
+static void javaScriptCallback(WKSerializedScriptValueRef resultSerializedScriptValue, WKErrorRef error, void* ctx)
+{
+    ASSERT_NOT_NULL(resultSerializedScriptValue);
+
+    JavaScriptCallbackContext* context = static_cast<JavaScriptCallbackContext*>(ctx);
+
+    JSGlobalContextRef scriptContext = JSGlobalContextCreate(0);
+    ASSERT_NOT_NULL(scriptContext);
+
+    JSValueRef scriptValue = WKSerializedScriptValueDeserialize(resultSerializedScriptValue, scriptContext, 0);
+    ASSERT_NOT_NULL(scriptValue);
+
+    context->actualString.adopt(JSValueToStringCopy(scriptContext, scriptValue, 0));
+    ASSERT_NOT_NULL(context->actualString.get());
+
+    context->didFinish = true;
+
+    JSGlobalContextRelease(scriptContext);
+
+    EXPECT_NULL(error);
+}
+
+::testing::AssertionResult runJSTest(const char*, const char*, const char*, WKPageRef page, const char* script, const char* expectedResult)
+{
+    JavaScriptCallbackContext context;
+    WKPageRunJavaScriptInMainFrame(page, Util::toWK(script).get(), &context, javaScriptCallback);
+    Util::run(&context.didFinish);
+
+    size_t bufferSize = JSStringGetMaximumUTF8CStringSize(context.actualString.get());
+    auto buffer = std::make_unique<char[]>(bufferSize);
+    JSStringGetUTF8CString(context.actualString.get(), buffer.get(), bufferSize);
+    
+    return compareJSResult(script, buffer.get(), expectedResult);
+}
+    
+::testing::AssertionResult compareJSResult(const char* script, const char* actualResult, const char* expectedResult)
+{
+    if (!strcmp(actualResult, expectedResult))
+        return ::testing::AssertionSuccess();
+
+    return ::testing::AssertionFailure()
+        << "JS expression: " << script << "\n"
+        << "       Actual: " << actualResult << "\n"
+        << "     Expected: " << expectedResult;
+}
+
+} // namespace TestWebKitAPI
+
+#endif