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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
+ * 
+ * $LicenseInfo:firstyear=2009&license=viewergpl$
+ * Copyright (c) 2009, Linden Research, Inc.
+ * $/LicenseInfo$
+ */
+
+#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) */