anchor.diff:      });
     });
   
  -  group("rotateDirections", () {
  +  group("RotateDirections", () {
       DirectionSystem directionSystem;
       setUp(() {
         directionSystem = new DirectionSystem();
  
positive.code:     });
    });
  
  }
  
  //=============================================================================
  
negative.code:       directionSystem = null;
      });
      test("Testing diagonal directions", () {
        testSetMainDirection(directionSystem, Direction.MAIN_DIRECTIONS,
            [{"x": 0,"y": -1}, {"x": 0,"y": 1},
             {"x": -1,"y": 0}, {"x": 1,"y": 0}]);
      });
      test("Testing diagonal directions", () {
        testSetMainDirection(directionSystem, Direction.DIAGONAL_DIRECTIONS,
            [{"x": -expectedDiagonalValue,"y": -expectedDiagonalValue},
             {"x": expectedDiagonalValue,"y": -expectedDiagonalValue},
             {"x": -expectedDiagonalValue,"y": expectedDiagonalValue},
  