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 SimulateMovement_ShouldReturnCorrectResult()
{
var simulator = new LawnMowerMovementSimulator();
var simulationResult =
simulator.SimulateMovement(
new LawnMowerState(new Position(3, 3), Direction.East),
new LawnSize(5, 5),
new[]
{
LawnMowerCommand.MoveForward,
LawnMowerCommand.TurnRight,
LawnMowerCommand.MoveForward,
LawnMowerCommand.MoveForward,
LawnMowerCommand.TurnLeft,
LawnMowerCommand.MoveForward,
});
var expectedSimulationResults = new[]
{
new LawnMowerState(new Position(4, 3), Direction.East), // after move east
new LawnMowerState(new Position(4, 3), Direction.South), // after turn right
new LawnMowerState(new Position(4, 2), Direction.South), // after move south
new LawnMowerState(new Position(4, 1), Direction.South), // after move south
new LawnMowerState(new Position(4, 1), Direction.East), // after turn left
new LawnMowerState(new Position(5, 1), Direction.East), // after move east
};
simulationResult
.Should()
.Equal(expectedSimulationResults);
}
public void SimulateMovement_ShouldThrowWhenCommandsIsNull()
{
var simulator = new LawnMowerMovementSimulator();
Action call = () =>
simulator.SimulateMovement(
new LawnMowerState(new Position(4, 1), Direction.East),
new LawnSize(5, 10),
null);
call.ShouldThrow<ArgumentNullException>();
}
public void SimulateMovement_ShouldThrowIfLawnMowerTriesToGoOutsideTheLawnBoundaries()
{
var simulator = new LawnMowerMovementSimulator();
var simulationResult =
simulator.SimulateMovement(
new LawnMowerState(new Position(3, 3), Direction.East),
new LawnSize(5, 5),
new[]
{
LawnMowerCommand.MoveForward, // 4, 3
LawnMowerCommand.MoveForward, // 5, 3
LawnMowerCommand.MoveForward, // 6, 3 -> this is outside
});
Action call = () => simulationResult.ToArray();
call.ShouldThrow<CannotMoveOutsideLawnBoundariesException>();
}
public void SimulateMovement_ShouldThrowWhenInitialStateIsNull()
{
var simulator = new LawnMowerMovementSimulator();
Action call = () =>
simulator.SimulateMovement(
null,
new LawnSize(5, 10),
new[] {LawnMowerCommand.MoveForward,});
call.ShouldThrow<ArgumentNullException>();
}