update UnitTest Ship

src/test_/java/ShipTest.java

@@ -1,8 +1,7 @@
 import BattleShip.Ship;
 import org.junit.jupiter.api.Test;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.*;
 
 class ShipTest {
     @Test
@@ -19,5 +18,9 @@ class ShipTest {
         ship.counter();
         assertFalse(ship.isKilled());
         assertEquals(2, ship.numOfHits);
+
+        ship.counter();
+        assertTrue(ship.isKilled());
+        assertEquals(3, ship.numOfHits);
     }
 }