软件测试（四）——Graph Coverage 作业

 1     public static void printPrimes (int n) 
 2     { 
 3         int curPrime; // Value currently considered for primeness 
 4         int numPrimes; // Number of primes found so far. 
 5         boolean isPrime; // Is curPrime prime? 
 6         int [] primes = new int [MAXPRIMES]; // The list of prime numbers. 
 7         
 8         // Initialize 2 into the list of primes. 
 9         primes [0] = 2; 
10         numPrimes = 1; 
11         curPrime = 2; 
12         while (numPrimes < n) 
13         { 
14             curPrime++; // next number to consider ... 
15             isPrime = true; 
16             for (int i = 0; i <= numPrimes-1; i++) 
17             { // for each previous prime. 
18                 if (isDivisible(primes[i], curPrime)) 
19                 { // Found a divisor, curPrime is not prime. 
20                     isPrime = false; 
21                     break; // out of loop through primes. 
22                 } 
23             } 
24             if (isPrime) 
25             { // save it! 
26                 primes[numPrimes] = curPrime; 
27                 numPrimes++; 
28             } 
29         } // End while 
30         
31         // Print all the primes out. 
32         for (int i = 0; i <= numPrimes-1; i++) 
33         { 
34             System.out.println ("Prime: " + primes[i]); 
35         } 
36     } // end printPrimes

 1 package com.Primes;
 2 
 3 import java.io.ByteArrayOutputStream;
 4 import java.io.PrintStream;
 5 
 6 import junit.framework.TestCase;
 7 
 8 public class PrimesTest extends TestCase {
 9 
10     private Primes prime = null;
11     PrintStream console = null;          // 声明（为null）：输出流 (字符设备) console
12     ByteArrayOutputStream bytes = null;  // 声明（为null）：bytes 用于缓存console 重定向过来的字符流
13     
14     protected void setUp() throws Exception {
15         super.setUp();
16         prime = new Primes();
17         bytes = new ByteArrayOutputStream();    // 分配空间
18         console = System.out;                   // 获取System.out 输出流的句柄
19         System.setOut(new PrintStream(bytes));  // 将原本输出到控制台Console的字符流 重定向 到 bytes
20     }
21 
22     protected void tearDown() throws Exception {
23         super.tearDown();
24         System.setOut(console);
25     }
26 
27     public void testPrintPrimes() {
28         String s = new String("Prime: 2\r\nPrime: 3\r\nPrime: 5\r\n");    // 注意：控制台的换行，这里用 ‘\n‘ 表示
29         prime.printPrimes(3);
30         assertEquals(s, bytes.toString());          // bytes.toString() 作用是将 bytes内容 转换为字符流
31     }
32 
33 }