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diff --git a/net/base/wininet_util_unittest.cc b/net/base/wininet_util_unittest.cc
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+++ b/net/base/wininet_util_unittest.cc
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+// Copyright 2008, Google 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:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * 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.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+// OWNER OR 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 <windows.h>
+#include <wininet.h>
+
+#include "net/base/net_errors.h"
+#include "net/base/wininet_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using net::WinInetUtil;
+
+namespace {
+  class WinInetUtilTest : public testing::Test {
+  };
+}
+
+TEST(WinInetUtilTest, ErrorCodeConversion) {
+  // a list of Windows error codes and the corresponding
+  // net::ERR_xxx error codes
+  static const struct {
+    DWORD os_error;
+    int net_error;
+  } error_cases[] = {
+    {ERROR_SUCCESS, net::OK},
+    {ERROR_IO_PENDING, net::ERR_IO_PENDING},
+    {ERROR_INTERNET_OPERATION_CANCELLED, net::ERR_ABORTED},
+    {ERROR_INTERNET_CANNOT_CONNECT, net::ERR_CONNECTION_FAILED},
+    {ERROR_INTERNET_NAME_NOT_RESOLVED, net::ERR_NAME_NOT_RESOLVED},
+    {ERROR_INTERNET_INVALID_CA, net::ERR_CERT_AUTHORITY_INVALID},
+    {999999, net::ERR_FAILED},
+  };
+
+  for (int i = 0; i < arraysize(error_cases); i++) {
+    EXPECT_EQ(error_cases[i].net_error,
+              WinInetUtil::OSErrorToNetError(error_cases[i].os_error));
+  }
+}