软件测试作业3
程序如下:
public static void printPrimes(int n) { int curPrime; // Value currently considered for primeness int numPrimes; // Number of primes found so far. boolean isPrime; // Is curPrime prime? int[] primes = new int[100]; // The list of prime numbers. // Initialize 2 into the list of primes. primes[0] = 2; numPrimes = 1; curPrime = 2; while (numPrimes < n) { curPrime++; // next number to consider ... isPrime = true; for (int i = 0; i <= numPrimes - 1; i++) { // for each previous prime. if (isDivisable(primes[i], curPrime)) { // Found a divisor, curPrime is not prime. isPrime = false; break; // out of loop through primes. } } if (isPrime) { // save it! primes[numPrimes] = curPrime; numPrimes++; } } // End while // Print all the primes out. for (int i = 0; i <= numPrimes - 1; i++) { System.out.println("Prime: " + primes[i]); } } // end printPrimes
(a)
绘制控制流图:
(b)
将while循环中的条件改为numPrimes < 3,如果n = 3,程序不会发现错误;但当n = 5时,程序会很快发现错误。
(c)
令n = 1即可。
(d)
节点覆盖:
TR = {1,2,3,4,5,6,7,8,9,10,11,12,13};
边覆盖:
TR = {(1,2),(2,3),(2,10),(3,4),(4,5),(4,8),(5,6),(5,7),(6,8),(7,4),(8,2),(8,9),(9,1),(2,10),(10,11),(11,12),(12,11),(12,13)};
主路径覆盖:
TR = {(3,4,5,6,8,9,2,10,11,12),(3,4,5,6,8,9,2,10,11,13),(7,4,5,6,8,9,2,10,11,12),(7,4,5,6,8,9,2,10,11,13)};
主路径覆盖测试代码:
package st_homework2; import static org.junit.Assert.*; import java.io.ByteArrayOutputStream; import java.io.PrintStream; import org.junit.Before; import org.junit.Test; public class PrimeTest { Prime prime; ByteArrayOutputStream baos; @Before public void setUp() throws Exception { prime = new Prime(); baos = new ByteArrayOutputStream(); System.setOut(new PrintStream(baos)); } @Test public void testPrintPrimes() { String outcome = new String("Prime: 2\r\nPrime: 3\r\nPrime: 5\r\nPrime: 7\r\nPrime: 11\r\nPrime: 13\r\nPrime: 17\r\nPrime: 19\r\n"); prime.printPrimes(8); assertEquals(outcome, baos.toString()); } }
程序将输出的控制台的数据流重定向到另外的新的打印流,也就是我们提前设置的字节输出流内,然后将它与我们设想的输出字符串比较。结果如下:
posted on 2018-03-26 23:40 tju_c6h5ch3 阅读(109) 评论(0) 编辑 收藏 举报