move backward successfully

src/main/java/cat/hack3/codingtests/marsrover/MarsMap.java

@@ -3,7 +3,16 @@ package cat.hack3.codingtests.marsrover;
 import static cat.hack3.codingtests.marsrover.MarsMap.Direction.*;
 
 public class MarsMap {
-    public enum Direction {NORTH, SOUTH, EAST, WEST}
+    public enum Direction {NORTH, SOUTH, EAST, WEST;
+        public Direction reversed() {
+            return switch (this) {
+                case NORTH -> SOUTH;
+                case SOUTH -> NORTH;
+                case EAST -> WEST;
+                case WEST -> EAST;
+            };
+        }
+    }
     private final int width;
     private final int height;
 

src/main/java/cat/hack3/codingtests/marsrover/MarsRover.java

@@ -15,6 +15,10 @@ public class MarsRover {
         return currentCoordinates.updatePositionTowards(currentDirection);
     }
 
+    public Coordinates moveBackwards() {
+        return currentCoordinates.updatePositionTowards(currentDirection.reversed());
+    }
+
     public MarsMap.Direction turnLeft() {
         currentDirection = marsMap.changeDirectionToLeft(currentDirection);
         return currentDirection;

src/test/java/cat/hack3/codingtests/marsrover/MarsRoverTest.java

@@ -37,6 +37,13 @@ public class MarsRoverTest {
         assertEquals(rover.getCurrentDirection(), SOUTH);
     }
 
+    @Test
+    public void stepBackwards() {
+        Coordinates currentPosition = rover.moveBackwards();
+        assertEquals(currentPosition, Coordinates.of(1, 3));
+        assertEquals(rover.getCurrentDirection(), SOUTH);
+    }
+
     @Test
     public void turnLef() {
         Direction currentDirection = rover.turnLeft();