junit基础篇、中级篇实例代码

学习文章：

http://blog.csdn.net/andycpp/article/details/1327147

http://wenku.baidu.com/link?url=C27gDEj0l-AyPuyUOOYJaezxGF-U-mozQbjlA-R9apKXdw8h-GV3VoPzS4P4WADISon7615JCLfSpMjtuiqIVcBWJ0o7icgKk_2Qi2jF0yq

实例代码目录结构：

Calculator.java:

public class Calculator{
    private static int result;//静态变量，用于存储运行结果
    
    public void add(int n){
        result = result+n;
    }
    
    public void substract(int n){
        result = result-1;//bug：之前应该是 result = result-n
    }
    
    public void multiply(int n){
        
    }//此方法尚未写好
    
    public void divide(int n){
        result = result/n;
    }
    
    public void square(int n){
        result = n*n;
    }
    
    public void squareRoot(int n){
        for(;;){}  //bug：死循环
    }
    
    public void clear(){
        result = 0;
    }
    
    public int getResult(){
        return result;
    }
}

CalculatorTest.java:

import static org.junit.Assert.*;

import org.junit.After;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;


public class CalculatorTest {

    private static Calculator calculator = new Calculator();
    
    @Before
    public void setUp() throws Exception {
        calculator.clear();
    }

    @After
    public void tearDown() throws Exception {
    }

    @Test
    public void testAdd() {
        calculator.add(2);
        calculator.add(3);
        assertEquals(5,calculator.getResult());
    }

    @Test
    public void testSubstract() {
        calculator.add(10);
        calculator.substract(2);
        assertEquals(8,calculator.getResult());
    }

    @Ignore("Multiply() Not yet implemented")
    @Test
    public void testMultiply() {
        
    }

    @Test
    public void testDivide() {
        calculator.add(8);
        calculator.divide(2);
        assertEquals(4,calculator.getResult());
    }

    @Test(timeout = 1000)
    public void squareRoot(){
        calculator.squareRoot(4);
        assertEquals(2,calculator.getResult());
    }
    
    @Test(expected = ArithmeticException.class)
    public void divideByZero(){
        calculator.divide(0);
    }
}

执行结果，"failure Trace"报错或运行失败原因：

（1）squareRoot超时，报错

（2）testSubstract用例失败

（3）testMultiply忽略运行

执行单个用例：

选中用例，右键点击“Run”