private static string PerformSimulation(
LawnMowerState initialState,
LawnSize lawnSize,
LawnMowerCommand[] commands)
{
var simulator = new LawnMowerMovementSimulator();
try
{
var lawnMowerSteps =
simulator.SimulateMovement(
initialState,
lawnSize,
commands);
var finalState = lawnMowerSteps
.Last();
return $"{finalState.Position.X} {finalState.Position.Y} {finalState.Direction.Sign}";
}
catch (CannotMoveOutsideLawnBoundariesException)
{
return "Mower tried to cut rare plants";
}
}
public void TwoTheSameLawnSizesShouldBeEqual()
{
var lawnSize1 = new LawnSize(5, 10);
var lawnSize2 = new LawnSize(5, 10);
(lawnSize1.Equals(lawnSize2))
.Should()
.BeTrue();
}
public void TwoDifferentLawnSizesShouldNotBeEqual()
{
var lawnSize1 = new LawnSize(5, 10);
var lawnSize2 = new LawnSize(10, 10);
(lawnSize1.Equals(lawnSize2))
.Should()
.BeFalse();
}
public void IsPositionWithinLawn_ShouldReturnTrueWhenPositionIsWithin(
int positionX,
int positionY)
{
var lawnSize = new LawnSize(5, 10);
var position = new Position(positionX, positionY);
lawnSize
.IsPositionWithinLawn(position)
.Should()
.BeTrue();
}
private IEnumerable<LawnMowerState> SimulateMovementImpl(
LawnMowerState initialState,
LawnSize lawnSize,
IEnumerable<LawnMowerCommand> commands)
{
var currentState = initialState;
foreach (var command in commands)
{
currentState = PerformCommand(currentState, command);
if (!lawnSize.IsPositionWithinLawn(currentState.Position))
{
throw new CannotMoveOutsideLawnBoundariesException();
}
yield return currentState;
}
}
public IEnumerable<LawnMowerState> SimulateMovement(
LawnMowerState initialState,
LawnSize lawnSize,
IEnumerable<LawnMowerCommand> commands)
{
if (initialState == null)
{
throw new ArgumentNullException(nameof(initialState));
}
if (lawnSize == null)
{
throw new ArgumentNullException(nameof(lawnSize));
}
if (commands == null)
{
throw new ArgumentNullException(nameof(commands));
}
// actual implementation is in separate method to force execution of arguments checks before iterating the result
return SimulateMovementImpl(initialState, lawnSize, commands);
}
protected bool Equals(LawnSize other)
{
return RightmostCoordinate == other.RightmostCoordinate && TopmostCoordinate == other.TopmostCoordinate;
}
public void ParseLawnSize_ShouldReturnCorrectLawnSizeWhenInputIsValid(
string input,
int expectedTopmostCoordinate,
int expectedRightmostCoordinate)
{
var inputParser = new InputParser();
var lawnSize = inputParser.ParseLawnSize(input);
var expectedLawnSize = new LawnSize(
expectedRightmostCoordinate,
expectedTopmostCoordinate);
lawnSize
.Should()
.Be(expectedLawnSize);
}
protected bool Equals(LawnSize other)
{
return(RightmostCoordinate == other.RightmostCoordinate && TopmostCoordinate == other.TopmostCoordinate);
}