prepare failing test for the planet loop requirement

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

@@ -58,4 +58,8 @@ public class Coordinates {
                 ", longitude=" + longitude +
                 '}';
     }
+
+    public Coordinates copy() {
+        return new Coordinates(latitude, longitude);
+    }
 }

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

@@ -25,7 +25,7 @@ public class MarsRover {
     }
 
     public Coordinates getCurrentCoordinates() {
-        return currentCoordinates;
+        return currentCoordinates.copy();
     }
 
     public MarsMap.Direction getCurrentDirection() {

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

@@ -28,13 +28,23 @@ public class MarsRoverTest {
 
     @Test
     public void stepForward() {
-        Coordinates currentPosition = rover.moveForward();
-        assertEquals(currentPosition, Coordinates.of(3, 3));
-        assertEquals(rover.getCurrentDirection(), SOUTH);
+        Direction originalDirection = rover.getCurrentDirection();
 
-        repeatAction(5, i -> rover.moveForward());
-        assertEquals(rover.getCurrentCoordinates(), Coordinates.of(8, 3));
-        assertEquals(rover.getCurrentDirection(), SOUTH);
+        Coordinates oneStepForward = rover.moveForward();
+
+        assertEquals(oneStepForward, Coordinates.of(3, 3));
+        assertEquals(rover.getCurrentDirection(), originalDirection);
+    }
+
+    @Test
+    public void loopTheWorldMovingForward() {
+        Coordinates originalCoordinates = rover.getCurrentCoordinates();
+        Direction originalDirection = rover.getCurrentDirection();
+
+        repeatAction(10, i -> rover.moveForward());
+
+        assertEquals(rover.getCurrentCoordinates(), originalCoordinates);
+        assertEquals(rover.getCurrentDirection(), originalDirection);
     }
 
     @Test