Added static method to convert arbitrary ErrorID to a string.

Updated tests to print ErrorID and bool values as strings.

tinyxml2.cpp

@@ -2226,14 +2226,19 @@ void XMLDocument::SetError( XMLError error, const char* str1, const char* str2 )
 		_errorStr2.SetStr(str2);
 }
 
-const char* XMLDocument::ErrorName() const
+const char* XMLDocument::ErrorName(XMLError errorID)
 {
-	TIXMLASSERT( _errorID >= 0 && _errorID < XML_ERROR_COUNT );
-    const char* errorName = _errorNames[_errorID];
+	TIXMLASSERT( errorID >= 0 && errorID < XML_ERROR_COUNT );
+    const char* errorName = _errorNames[errorID];
     TIXMLASSERT( errorName && errorName[0] );
     return errorName;
 }
 
+const char* XMLDocument::ErrorName() const
+{
+    return ErrorName(_errorID);
+}
+
 void XMLDocument::PrintError() const
 {
     if ( Error() ) {

tinyxml2.h

@@ -1749,6 +1749,7 @@ public:
         return _errorID;
     }
 	const char* ErrorName() const;
+    static const char* ErrorName(XMLError errorID);
 
     /// Return a possibly helpful diagnostic location or string.
     const char* GetErrorStr1() const {

xmltest.cpp

@@ -63,6 +63,15 @@ bool XMLTest (const char* testString, const char* expected, const char* found, b
 	return pass;
 }
 
+bool XMLTest(const char* testString, XMLError expected, XMLError found, bool echo = true, bool extraNL = false)
+{
+    return XMLTest(testString, XMLDocument::ErrorName(expected), XMLDocument::ErrorName(found), echo, extraNL);
+}
+
+bool XMLTest(const char* testString, bool expected, bool found, bool echo = true, bool extraNL = false)
+{
+    return XMLTest(testString, expected ? "true" : "false", found ? "true" : "false", echo, extraNL);
+}
 
 template< class T > bool XMLTest( const char* testString, T expected, T found, bool echo=true )
 {