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diff --git a/indra/llcommon/tests/wrapllerrs.h b/indra/llcommon/tests/wrapllerrs.h
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+++ b/indra/llcommon/tests/wrapllerrs.h
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+/**
+ * @file   wrapllerrs.h
+ * @author Nat Goodspeed
+ * @date   2009-03-11
+ * @brief  Define a class useful for unit tests that engage llerrs (LL_ERRS) functionality
+ * 
+ * $LicenseInfo:firstyear=2009&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#if ! defined(LL_WRAPLLERRS_H)
+#define LL_WRAPLLERRS_H
+
+#include "llerrorcontrol.h"
+
+struct WrapLL_ERRS
+{
+    WrapLL_ERRS():
+        // Resetting Settings discards the default Recorder that writes to
+        // stderr. Otherwise, expected llerrs (LL_ERRS) messages clutter the
+        // console output of successful tests, potentially confusing things.
+        mPriorErrorSettings(LLError::saveAndResetSettings()),
+        // Save shutdown function called by LL_ERRS
+        mPriorFatal(LLError::getFatalFunction())
+    {
+        // Make LL_ERRS call our own operator() method
+        LLError::setFatalFunction(boost::bind(&WrapLL_ERRS::operator(), this, _1));
+    }
+
+    ~WrapLL_ERRS()
+    {
+        LLError::setFatalFunction(mPriorFatal);
+        LLError::restoreSettings(mPriorErrorSettings);
+    }
+
+    struct FatalException: public std::runtime_error
+    {
+        FatalException(const std::string& what): std::runtime_error(what) {}
+    };
+
+    void operator()(const std::string& message)
+    {
+        // Save message for later in case consumer wants to sense the result directly
+        error = message;
+        // Also throw an appropriate exception since calling code is likely to
+        // assume that control won't continue beyond LL_ERRS.
+        throw FatalException(message);
+    }
+
+    std::string error;
+    LLError::Settings* mPriorErrorSettings;
+    LLError::FatalFunction mPriorFatal;
+};
+
+#endif /* ! defined(LL_WRAPLLERRS_H) */