@Test
 public void method2() {
   int[] arr = {-1, -2, -3, -4, -5};
   LargestNumberInArray larg = new LargestNumberInArray();
   int expected = -1;
   int actual = larg.lagestNum(arr);
   assertEquals(expected, actual);
 }
 @Test
 public void method1() {
   int[] arr = {67, 46, 34, 5};
   LargestNumberInArray larg = new LargestNumberInArray();
   int expected = 67;
   int actual = larg.lagestNum(arr);
   assertEquals(expected, actual);
 }