public void Execute(string turtleCommandTemplate)
{
if (string.IsNullOrWhiteSpace(turtleCommandTemplate))
{
throw new BadCommandException();
}
var turtleCommands = turtleCommandTemplate.Split(new[] { CommandDelimeter }, StringSplitOptions.RemoveEmptyEntries);
if (turtleCommands.Length > 2)
{
throw new BadCommandException();
}
if (!Enum.TryParse <TurtleCommand>(turtleCommands[0], true, out var command))
{
throw new BadCommandException();
}
switch (command)
{
case TurtleCommand.PLACE:
if (turtleCommands.Length != 2)
{
throw new BadCommandException();
}
//validating the positioning arguments
_positionFilter.Execute(turtleCommands[1]);
break;
default:
if (turtleCommands.Length != 1)
{
throw new BadCommandException();
}
break;
}
//all good and getting the command and position values
TurtleCommand = command;
Position = _positionFilter.Position;
}
public void bad_command_when_argument_template_empty_or_null()
{
Assert.Throws <BadCommandException>(() => _positionFilter.Execute(string.Empty));
Assert.Throws <BadCommandException>(() => _positionFilter.Execute(null));
}