public class Calculate {public int add(int a, int b) {return a + b;}public int sub(int a, int b) {return a - b;}
}

public class Car {public int getWheels() {return 4;}
}

public class  Rectangle{public int getArea(int width,int height){return width*height;}
}

public class CalculateTest {Calculate calculate;@Beforepublic void setUp() throws Exception {calculate = new Calculate();}@Testpublic void testAdd() {int result = calculate.add(12, 12);assertEquals(24, result);}@Testpublic void testSub() {int result = calculate.sub(12, 12);assertEquals(0, result);}}

public class CarTest {Car car;@Beforepublic void setUp() throws Exception {car = new Car();}@Testpublic void testGetWheels() {int result = car.getWheels();assertEquals(4, result);}}

public class RectangleTest {Rectangle rectangle;@Beforepublic void setUp() throws Exception {rectangle=new Rectangle();}@Testpublic void testGetArea() {int result = rectangle.getArea(12, 2);assertEquals(24, result);}
}

@RunWith(Suite.class)
@SuiteClasses({ CalculateTest.class, CarTest.class, RectangleTest.class })
public class AllTests {}

@RunWith(Parameterized.class)
public class CalculateTest2 {Calculate calculate;private int input1;private int input2;private int expected;@Parameterspublic static Collection prepareData() {Object[][] object = { { -1, -2, -3 }, { 0, 2, 2 }, { -1, 1, 0 },{ 1, 2, 3 } };return Arrays.asList(object);}public CalculateTest2(int input1, int input2, int expected) {this.input1 = input1;this.input2 = input2;this.expected = expected;}@Beforepublic void setUp() throws Exception {calculate = new Calculate();}@Testpublic void testAdd() {int result = calculate.add(input1, input2);assertEquals(expected, result);}
}