tdd-katas/test/mars_rover_test.dart

import 'package:tdd_katas/mars_rover.dart';
import 'package:test/test.dart';

void main() {
  group('Mars Rover:', () {
    test('rover reports initial position and direction', () {
      final rover = Rover(x: 0, y: 0, direction: 'N');

      expect(rover.x, equals(0));
      expect(rover.y, equals(0));
      expect(rover.direction, equals('N'));
    });

    group('Turning Left:', () {
      test('from North faces West', () {
        final rover = Rover(x: 0, y: 0, direction: 'N');
        rover.turnLeft();
        expect(rover.direction, equals('W'));
      });

      test('from West faces South', () {
        final rover = Rover(x: 0, y: 0, direction: 'W');
        rover.turnLeft();
        expect(rover.direction, equals('S'));
      });

      test('from South faces East', () {
        final rover = Rover(x: 0, y: 0, direction: 'S');
        rover.turnLeft();
        expect(rover.direction, equals('E'));
      });

      test('from East faces North', () {
        final rover = Rover(x: 0, y: 0, direction: 'E');
        rover.turnLeft();
        expect(rover.direction, equals('N'));
      });
    });

    group('Turning Right:', () {
      test('from North faces East', () {
        final rover = Rover(x: 0, y: 0, direction: 'N');
        rover.turnRight();
        expect(rover.direction, equals('E'));
      });

      test('from East faces South', () {
        final rover = Rover(x: 0, y: 0, direction: 'E');
        rover.turnRight();
        expect(rover.direction, equals('S'));
      });

      test('from South faces West', () {
        final rover = Rover(x: 0, y: 0, direction: 'S');
        rover.turnRight();
        expect(rover.direction, equals('W'));
      });

      test('from West faces North', () {
        final rover = Rover(x: 0, y: 0, direction: 'W');
        rover.turnRight();
        expect(rover.direction, equals('N'));
      });
    });

    group('Moving Forward:', () {
      test('facing North increases Y', () {
        final rover = Rover(x: 0, y: 0, direction: 'N');
        rover.moveForward();
        expect(rover.x, equals(0));
        expect(rover.y, equals(1));
      });

      test('facing East increases X', () {
        final rover = Rover(x: 0, y: 0, direction: 'E');
        rover.moveForward();
        expect(rover.x, equals(1));
        expect(rover.y, equals(0));
      });

      test('facing South decreases Y', () {
        final rover = Rover(x: 0, y: 5, direction: 'S');
        rover.moveForward();
        expect(rover.x, equals(0));
        expect(rover.y, equals(4));
      });

      test('facing West decreases X', () {
        final rover = Rover(x: 5, y: 0, direction: 'W');
        rover.moveForward();
        expect(rover.x, equals(4));
        expect(rover.y, equals(0));
      });
    });

    group('Executing Command Sequences:', () {
      test('single command L', () {
        final rover = Rover(x: 0, y: 0, direction: 'N');
        rover.execute('L');
        expect(rover.direction, equals('W'));
      });

      test('single command R', () {
        final rover = Rover(x: 0, y: 0, direction: 'N');
        rover.execute('R');
        expect(rover.direction, equals('E'));
      });

      test('single command M', () {
        final rover = Rover(x: 0, y: 0, direction: 'N');
        rover.execute('M');
        expect(rover.y, equals(1));
      });

      test('complex sequence MMRMMLM', () {
        final rover = Rover(x: 0, y: 0, direction: 'N');
        rover.execute('MMRMMLM');
        expect(rover.x, equals(2));
        expect(rover.y, equals(3));
        expect(rover.direction, equals('N'));
      });

      test('example from Mars Rover kata', () {
        final rover = Rover(x: 1, y: 2, direction: 'N');
        rover.execute('LMLMLMLMM');
        expect(rover.x, equals(1));
        expect(rover.y, equals(3));
        expect(rover.direction, equals('N'));
      });
    });

    group('Plateau Boundaries:', () {
      test('wraps around when moving North past boundary', () {
        final rover = Rover(
          x: 0,
          y: 5,
          direction: 'N',
          plateauWidth: 5,
          plateauHeight: 5,
        );
        rover.moveForward();
        expect(rover.y, equals(0));
      });

      test('wraps around when moving East past boundary', () {
        final rover = Rover(
          x: 5,
          y: 0,
          direction: 'E',
          plateauWidth: 5,
          plateauHeight: 5,
        );
        rover.moveForward();
        expect(rover.x, equals(0));
      });

      test('wraps around when moving South past boundary', () {
        final rover = Rover(
          x: 0,
          y: 0,
          direction: 'S',
          plateauWidth: 5,
          plateauHeight: 5,
        );
        rover.moveForward();
        expect(rover.y, equals(5));
      });

      test('wraps around when moving West past boundary', () {
        final rover = Rover(
          x: 0,
          y: 0,
          direction: 'W',
          plateauWidth: 5,
          plateauHeight: 5,
        );
        rover.moveForward();
        expect(rover.x, equals(5));
      });

      test('example with wrapping', () {
        final rover = Rover(
          x: 5,
          y: 5,
          direction: 'N',
          plateauWidth: 5,
          plateauHeight: 5,
        );
        rover.execute('MMM');
        expect(rover.y, equals(2));
      });
    });
  });
}