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diff --git a/WebKitTools/TestWebKitAPI/Tests/WebKit2/PreventEmptyUserAgent.cpp b/WebKitTools/TestWebKitAPI/Tests/WebKit2/PreventEmptyUserAgent.cpp
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+++ b/WebKitTools/TestWebKitAPI/Tests/WebKit2/PreventEmptyUserAgent.cpp
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2010 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 "Test.h"
+
+#include "PlatformUtilities.h"
+#include "PlatformWebView.h"
+#include <WebKit2/WKRetainPtr.h>
+#include <WebKit2/WebKit2.h>
+
+namespace TestWebKitAPI {
+
+static bool testDone;
+
+static void didRunJavaScript(WKStringRef resultString, WKErrorRef error, void* context)
+{
+    TEST_ASSERT(context == reinterpret_cast<void*>(0x1234578));
+    
+    // Make sure that the result of navigator.userAgent isn't empty, even if we set the custom
+    // user agent to the empty string.
+    TEST_ASSERT(!WKStringIsEmpty(resultString));
+
+    testDone = true;
+}
+
+TEST(WebKit2, PreventEmptyUserAgent)
+{
+    WKRetainPtr<WKContextRef> context(AdoptWK, WKContextCreate());
+    WKRetainPtr<WKPageNamespaceRef> pageNamespace(AdoptWK, WKPageNamespaceCreate(context.get()));
+    PlatformWebView webView(pageNamespace.get());
+
+    WKPageSetCustomUserAgent(webView.page(), WKStringCreateWithUTF8CString(""));
+    WKRetainPtr<WKStringRef> javaScriptString(AdoptWK, WKStringCreateWithUTF8CString("navigator.userAgent"));
+    WKPageRunJavaScriptInMainFrame(webView.page(), javaScriptString.get(), reinterpret_cast<void*>(0x1234578), didRunJavaScript);
+
+    Util::run(&testDone);
+}
+
+} // namespace TestWebKitAPI