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diff --git a/indra/newview/tests/llviewerhelputil_test.cpp b/indra/newview/tests/llviewerhelputil_test.cpp
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+/** 
+ * @file llviewerhelputil_test.cpp
+ * @brief LLViewerHelpUtil tests
+ * @author Tofu Linden
+ *
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+#include "../test/lltut.h"
+
+#include "../llviewerhelputil.h"
+#include "llcontrol.h"
+#include "llsys.h"
+
+#include <iostream>
+
+//----------------------------------------------------------------------------
+// Implementation of enough of LLControlGroup to support the tests:
+
+static std::map<std::string,std::string> test_stringvec;
+
+LLControlGroup::LLControlGroup(const std::string& name)
+	: LLInstanceTracker<LLControlGroup, std::string>(name)
+{
+}
+
+LLControlGroup::~LLControlGroup()
+{
+}
+
+// Implementation of just the LLControlGroup methods we requre
+BOOL LLControlGroup::declareString(const std::string& name,
+				   const std::string& initial_val,
+				   const std::string& comment,
+				   BOOL persist)
+{
+	test_stringvec[name] = initial_val;
+	return true;
+}
+
+void LLControlGroup::setString(const std::string& name, const std::string& val)
+{
+	test_stringvec[name] = val;
+}
+
+std::string LLControlGroup::getString(const std::string& name)
+{
+	return test_stringvec[name];
+}
+
+//----------------------------------------------------------------------------
+	
+namespace tut
+{
+    struct viewerhelputil
+    {
+    };
+    
+	typedef test_group<viewerhelputil> viewerhelputil_t;
+	typedef viewerhelputil_t::object viewerhelputil_object_t;
+	tut::viewerhelputil_t tut_viewerhelputil("viewerhelputil");
+
+	template<> template<>
+	void viewerhelputil_object_t::test<1>()
+	{
+		LLOSInfo osinfo;
+		LLControlGroup cgr("test");
+		cgr.declareString("HelpURLFormat", "fooformat", "declared_for_test", FALSE);
+		cgr.declareString("VersionChannelName", "foochannelname", "declared_for_test", FALSE);
+		cgr.declareString("Language", "foolanguage", "declared_for_test", FALSE);
+		std::string topic("test_topic");
+
+		std::string subresult;
+
+		cgr.setString("HelpURLFormat", "fooformat");
+		subresult = LLViewerHelpUtil::buildHelpURL(topic, cgr, osinfo);
+		ensure_equals("no substitution tags", subresult, "fooformat");
+
+		cgr.setString("HelpURLFormat", "");
+		subresult = LLViewerHelpUtil::buildHelpURL(topic, cgr, osinfo);
+		ensure_equals("blank substitution format", subresult, "");
+
+		cgr.setString("HelpURLFormat", "[LANGUAGE]");
+		cgr.setString("Language", "");
+		subresult = LLViewerHelpUtil::buildHelpURL(topic, cgr, osinfo);
+		ensure_equals("simple substitution with blank", subresult, "");
+
+		cgr.setString("HelpURLFormat", "[LANGUAGE]");
+		cgr.setString("Language", "Esperanto");
+		subresult = LLViewerHelpUtil::buildHelpURL(topic, cgr, osinfo);
+		ensure_equals("simple substitution", subresult, "Esperanto");
+
+		cgr.setString("HelpURLFormat", "[XXX]");
+		subresult = LLViewerHelpUtil::buildHelpURL(topic, cgr, osinfo);
+		ensure_equals("unknown substitution", subresult, "[XXX]");
+
+		cgr.setString("HelpURLFormat", "[LANGUAGE]/[LANGUAGE]");
+		cgr.setString("Language", "Esperanto");
+		subresult = LLViewerHelpUtil::buildHelpURL(topic, cgr, osinfo);
+		ensure_equals("multiple substitution", subresult, "Esperanto/Esperanto");
+	}
+    
+}