Junit 4.x 单元测试，参数化测试，套件测试 实例

对下面三个类进行单元测试 ，组成套件测试。

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;
    }
}

 测试代码：建议把测试代码放在test源文件中

public class CalculateTest {
    Calculate calculate;

    @Before
    public void setUp() throws Exception {
        calculate = new Calculate();
    }

    @Test
    public void testAdd() {
        int result = calculate.add(12, 12);
        assertEquals(24, result);
    }

    @Test
    public void testSub() {
        int result = calculate.sub(12, 12);
        assertEquals(0, result);
    }

}

public class CarTest {
    Car car;

    @Before
    public void setUp() throws Exception {
        car = new Car();
    }

    @Test
    public void testGetWheels() {
        int result = car.getWheels();
        assertEquals(4, result);
    }

}

public class RectangleTest {
    Rectangle rectangle;
    @Before
    public void setUp() throws Exception {
        rectangle=new Rectangle();
    }

    @Test
    public void testGetArea() {
        int result = rectangle.getArea(12, 2);
        assertEquals(24, result);
    }
}

测试套件代码：

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

}

请用下面的参数对Calculate类的add方法进行参数化的测试

              {2,1,1},

              {2,0,2},

              {0,2,-2},

@RunWith(Parameterized.class)
public class CalculateTest2 {
    Calculate calculate;
    private int input1;
    private int input2;
    private int expected;
    @Parameters
    public 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;
    }

    @Before
    public void setUp() throws Exception {
        calculate = new Calculate();
    }

    @Test
    public void testAdd() {
        int result = calculate.add(input1, input2);
        assertEquals(expected, result);
    }
}