使用Junit做单元测试

1.实验目的：

1)理解单元测试原理
2)学会使用Junit做单元测试

2.实验方法：

1)确定测试单元
2)设计测试用例

3实验内容：

1)编写四则运算程序
2)确定测试单元
3)设计测试用例
4)使用Junit做单元测试

4.具体实验：

1)编写四则运算程序

package javaapplication1;

public class MathClass {
    private double x1;
    private double x2;
    private double result;
    public void plus(double para1,double para2){
        result = para1 + para2;
    }
    public void minus(double para1,double para2){
        result = para1 - para2;
    }
    public void multiply(double para1,double para2){
        result = para1 * para2;
    }
    public void divide(double para1,double para2){
        result = para1 / para2;
    }
    public double getResult(){
        return result;
    }
}

2)确定测试单元

@Test
    public void testPlus() {
        System.out.print("plus: ");
        double para1 = 1.6;
        double para2 = 1.2;
        MathClass instance = new MathClass();
        instance.plus(para1, para2);
        // TODO review the generated test code and remove the default call to fail.
        assertEquals(2.8, instance.getResult(), 0.00001);
        System.out.println(instance.getResult());
    }

    /**
     * Test of minus method, of class MathClass.
     */
    @Test
    public void testMinus() {
        System.out.print("minus: ");
        double para1 = 1.6;
        double para2 = 1.2;
        MathClass instance = new MathClass();
        instance.minus(para1, para2);
        // TODO review the generated test code and remove the default call to fail.
        assertEquals(0.4, instance.getResult(), 0.00001);
        System.out.println(instance.getResult());
    }

    /**
     * Test of multiply method, of class MathClass.
     */
    @Test
    public void testMultiply() {
        System.out.print("multiply: ");
        double para1 = 2.6;
        double para2 = 1.2;
        MathClass instance = new MathClass();
        instance.multiply(para1, para2);
        // TODO review the generated test code and remove the default call to fail.
        assertEquals(3.12, instance.getResult(), 0.00001);
        System.out.println(instance.getResult());
    }

    /**
     * Test of divide method, of class MathClass.
     */
    @Test
    public void testDivide() {
        System.out.print("divide: ");
        double para1 = 3.12;
        double para2 = 2.6;
        MathClass instance = new MathClass();
        instance.divide(para1, para2);
        // TODO review the generated test code and remove the default call to fail.
        assertEquals(1.2, instance.getResult(), 0.00001);
        System.out.println(instance.getResult());
}

3)设计测试用例

plus: 1.6+1.2
minus:1.6-1.2
multiply:2.6*1.2
divide:3.12/2.6

4)使用Junit做单元测试