Allow testing ordering to be specified as declaration, lexicographical, or random. Allow random seed to be specified

include/external/clara.h

@@ -791,7 +791,7 @@ namespace Clara {
                 if( it == itEnd ) {
                     if( token.type == Parser::Token::Positional || !m_throwOnUnrecognisedTokens )
                         unusedTokens.push_back( token );
-                    else if( m_throwOnUnrecognisedTokens )
+                    else if( errors.empty() && m_throwOnUnrecognisedTokens )
                         errors.push_back( "unrecognised option: " + token.data );
                 }
             }