public ICommandParser CreateSut(string command = null, ICommandParserImplementation impl = null)
{
command ??= "";
impl ??= Substitute.For <ICommandParserImplementation>();
return(new CommandParser(command, impl));
}
public CommandParser(string command, ICommandParserImplementation impl = null)
{
command = command ?? throw new ArgumentNullException(nameof(command));
//Used for unit testing, the default behaviour should be to use
//_this_ as the implementation
_impl = impl ?? this;
_impl.Position = -1;
_impl.Command = command;
}