Updating Robot-Simulator Tests (New PR) (#1213)

* Updating Robot-Simulator Tests (New PR)

Old PR contained irrelevant commits.

Updated robot-simulator tests. 
Closes #1157

* Update RobotTest.java

Fixed duplicate method names causing compilation error and fixed checks. I'll keep in mind to add comments here instead of in the code.

* Update RobotTest.java

Fixed missing variables

* Update RobotTest.java

Clean up formatting

* Update RobotTest.java

Fixing new robot declaration parameters

exercises/robot-simulator/src/test/java/RobotTest.java

 public class RobotTest {
 
     @Test
-    public void testRobotIsCreatedWithCorrectInitialPosition() {
+    public void testRobotIsCreatedWithCorrectInitialPositionAndOrientation() {
+        final Orientation initialOrientation = Orientation.NORTH;
         final GridPosition initialGridPosition = new GridPosition(0, 0);
-        final Robot robot = new Robot(initialGridPosition, Orientation.NORTH);
+        final Robot robot = new Robot(initialGridPosition, initialOrientation);
 
+        assertEquals(robot.getOrientation(), initialOrientation);
         assertEquals(robot.getGridPosition(), initialGridPosition);
     }
 
     @Ignore("Remove to run test")
     @Test
-    public void testRobotIsCreatedWithCorrectInitialOrientation() {
-        final Orientation initialOrientation = Orientation.NORTH;
-        final Robot robot = new Robot(new GridPosition(0, 0), initialOrientation);
+    public void testNegativePositionsAreAllowed() {
+        final GridPosition initialGridPosition = new GridPosition(-1, -1);
+        final Orientation initialOrientation = Orientation.SOUTH;
+        final Robot robot = new Robot(initialGridPosition, initialOrientation);
 
         assertEquals(robot.getOrientation(), initialOrientation);
+        assertEquals(robot.getGridPosition(), initialGridPosition);
     }
 
     @Ignore("Remove to run test")