@Test
 public void isCorrectCalculationCylinderSquareWithRealValues() {
   Cylinder figure = new Cylinder(1.0, 1.0);
   assertEquals(4 * Math.PI, figure.calculateSquare(), DELTA);
 }
 @Test
 public void isCorrectCalculationCylinderSquareWithZeroValue() {
   Cylinder figure = new Cylinder(0, 0);
   assertEquals(0, figure.calculateSquare(), DELTA);
 }
 @Test
 public void isCorrectCalculationCylinderSquareWithIntegerValue() {
   Cylinder figure = new Cylinder(1, 1);
   assertEquals(4 * Math.PI, figure.calculateSquare(), DELTA);
 }