junit基础篇、中级篇-实例代码

学习文章：

http://blog.****.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”