Myeclipse 使用JUnit 进行单元测试

Java计算器源码（只实现了加减乘除四种简单的运算）：

 1 import java.math.BigDecimal;
 2 import java.text.Format;
 3 public class Caculator {
 4 private BigDecimal num1;
 5 private BigDecimal num2;
 6 private String result;
 7 
 8 public void setNum1(double num1) {
 9     this.num1 = new BigDecimal(num1);
10 }
11 
12 public void setNum2(double num2) {
13     this.num2 = new BigDecimal(num2);
14 }
15 private double _format(){
16     BigDecimal _num1 = new BigDecimal(result);
17     BigDecimal _num2 = new BigDecimal(1);
18     return _num1.divide(_num2, 5,BigDecimal.ROUND_HALF_UP).doubleValue();    
19 }
20 public String getResult() {
21     if(!result.equals("ERROR"))
22     {
23         double _res = _format();
24         if(_res>=Double.MAX_VALUE||_res<=-Double.MAX_VALUE)
25             result = "ERROR";
26         else
27             result = Double.toString(_format());        
28     }        
29     return result;
30 }
31 public void Add() {
32     BigDecimal _result;
33     _result = num1.add(num2);
34     result = _result.toString();    
35 }
36 public void Sub() {
37     BigDecimal _result;
38     _result = num1.subtract(num2);
39     result = _result.toString();    
40 }
41 public void Mul() {
42     BigDecimal _result;
43     _result = num1.multiply(num2);
44     result = _result.toString();    
45 }
46 public void Div() {
47     BigDecimal _result;
48     if(num2.doubleValue()!=0){
49         _result = num1.divide(num2);
50         result = _result.toString();
51     }
52     else 
53         result = "ERROR";
54     }
55     }

设计测试用例：

JUnit测试用例代码：

 1 import org.junit.Test;
 2 import java.math.BigDecimal;
 3 import junit.framework.TestCase;
 4 public class caculate_test extends TestCase {
 5     private Caculator ca = new Caculator();
 6     protected void setUp() throws Exception {
 7         super.setUp();
 8     }
 9     @Test
10     public void test_Add() {
11         ca.setNum1(1);
12         ca.setNum2(2);
13         ca.Add();
14         assertEquals("3.0", ca.getResult());
15         ca.setNum1(2.4);
16         ca.setNum2(1.2);
17         ca.Add();
18         assertEquals("3.6", ca.getResult());
19         ca.setNum1(Double.MAX_VALUE);
20         ca.setNum2(2);
21         ca.Add();
22         assertEquals("ERROR", ca.getResult());
23         }
24     @Test
25     public void test_Sub() {
26         ca.setNum1(1);
27         ca.setNum2(2);
28         ca.Sub();
29         assertEquals("-1.0", ca.getResult());
30         ca.setNum1(2.4);
31         ca.setNum2(1.2);
32         ca.Sub();
33         assertEquals("1.2", ca.getResult());
34         ca.setNum1(-Double.MAX_VALUE);
35         ca.setNum2(2);
36         ca.Sub();
37         assertEquals("ERROR", ca.getResult());
38         }
39     @Test
40     public void test_Mul() {
41         ca.setNum1(1);
42         ca.setNum2(2);
43         ca.Mul();
44         assertEquals("2.0", ca.getResult());
45         ca.setNum1(2.4);
46         ca.setNum2(1.2);
47         ca.Mul();
48         assertEquals("2.88", ca.getResult());
49         ca.setNum1(1.3);
50         ca.setNum2(0);
51         ca.Mul();
52         assertEquals("0.0", ca.getResult());
53         ca.setNum1(Double.MAX_VALUE);
54         ca.setNum2(2);
55         ca.Mul();
56         assertEquals("ERROR", ca.getResult());
57         }
58     @Test
59     public void test_Div() {
60         ca.setNum1(1);
61         ca.setNum2(2);
62         ca.Div();
63         assertEquals("0.5", ca.getResult());
64         ca.setNum1(2.4);
65         ca.setNum2(1.2);
66         ca.Div();
67         assertEquals("2.0", ca.getResult());
68         ca.setNum1(1.3);
69         ca.setNum2(0);
70         ca.Div();
71         assertEquals("ERROR", ca.getResult());
72         }
73 }

测试结果：

 

GitHub:https://github.com/TongWee/SoftwareTesting_Caculator/

posted @ 2015-05-25 16:43  Weston233  阅读(588)  评论(0)    收藏  举报