@Test
 public void testSquareOfTwoHundred() {
   Assert.assertTrue(
       (SqrtEstimationByBinarySearch.sqrt(200) * SqrtEstimationByBinarySearch.sqrt(200)
               - SqrtEstimationByBinarySearch.DELTA)
           > 0);
 }
 @Test
 public void testPerfectSquareOfFour() {
   Assert.assertEquals(2.0, SqrtEstimationByBinarySearch.sqrt(4));
 }
 @Test
 public void testPerfectSquareOfSixteen() {
   Assert.assertEquals(4.0, SqrtEstimationByBinarySearch.sqrt(16));
 }