public ConfigOptionBuilder setPropertyString( String propertyString, StringConverter converter ) {
        co.setPropertyString( propertyString );
        co.setConverter( converter );
        co.setHasArgument( true ); // TODO check if there are properties without arguments
        return this;
    }
if you don't have an argument, choose the value that is going to be inserted into the map instead

@param commandLineOption specification of the command line options
@param value the value that is going to be inserted into the map instead of the argument
jgiven-core/src/main/java/com/tngtech/jgiven/report/config/ConfigOptionBuilder.java