软件测试学习(4)

这周我们主要学习了路径覆盖的相关知识,首先来看一下这周的作业题

/******************************************************* 
     * Finds and prints n prime integers 
     * Jeff Offutt, Spring 2003 
     ******************************************************/ 
    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 [MAXPRIMES]; // 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 (curPrime%primes[i]==0) 
                { // 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

第一问是画控制流图,用网上的相关软件可以很容易的画出来

第二问是设计一个t2=(n=5)能发现但t1=(n=3)不能发现的错误

一个最直观的错误就是数组越界,n取的值越大,数组越界就越有可能发生

第三问是寻找一组不经过while循环的测试用例,n=1的时候就可以满足要求

第四问要求找出点覆盖、边覆盖和主路径覆盖的所有TR(测试需求)

点覆盖:{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}

边覆盖:{(1,2),(2,3),(2,12),(3,4),(4,5),(5,6),(6,7),(6,8),(7,5),(8,9),(5,9),(9,10),(9,11),(10,11),(11,2),(12,13),(13,14),(14,15),(15,13),(13,16)}

主路径覆盖:{(1,2,3,4,5,6,7),

(1,2,3,4,5,6,8,9,10,11),

(1,2,3,4,5,6,8,9,11),

(1,2,3,4,5,9,10,11),

(1,2,3,4,5,9,11),

(1,2,12,13,14,15),

(1,2,12,16),

(3,4,5,6,8,9,10,11,2,12,13,14,15),

(3,4,5,6,8,9,11,2,12,13,14,15),

(3,4,5,6,8,9,10,11,2,12,13,16),

(3,4,5,6,8,9,11,2,12,13,16),

(3,4,5,9,10,11,2,12,13,14,15),

(3,4,5,9,11,2,12,13,14,15),

(3,4,5,9,10,11,2,12,13,16),

(3,4,5,9,11,2,12,13,16),

(6,7,5,9,10,11,2,12,13,14,15),

(6,7,5,9,11,2,12,13,14,15),

(6,7,5,9,10,11,2,12,13,16),

(6,7,5,9,11,2,12,13,16),

(14,15,13,16),

(13,14,15,13),

(5,6,7,5),

(2,3,4,5,6,8,9,10,11,2),

(2,3,4,5,6,8,9,11,2),

(2,3,4,5,9,10,11,2),

(2,3,4,5,9,11,2),

}

最后,对任意程序设计主路径覆盖的测试用例,以上次的判断三角形的形状的程序为例

package cn.tju.st;

public class Triangle {
    public int a;
    public int b;
    public int c;
    public Triangle(int a,int b,int c)
    {
        this.a=a;
        this.b=b;
        this.c=c;
    }
    public String judge() {
        if(a==b&&b==c)
            return "equilateral";
        else if(a==b||b==c||c==a)
            return "isosceles";
        else {
            return "scalene";
        }
    }
}
package cn.tju.st;

import static org.junit.Assert.*;

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


public class TestTriangle {
    Triangle tri =null;
    @Before
    public void setUp() throws Exception {
        //System.out.println("This is before test");
    }

    @After
    public void tearDown() throws Exception {
        System.out.println("This is after test");
    }

    @Test
    public void test() {
        tri = new Triangle(3,3,3);
        assertEquals("equilateral",tri.judge());
        tri = new Triangle(2,3,3);
        assertEquals("isosceles",tri.judge());
        tri = new Triangle(3,4,5);
        assertEquals("scalene",tri.judge());
    }

}

三组测试用例(3,3,3),(2,3,3),(3,4,5)即可完成主路径覆盖

 

posted on 2016-03-25 21:42  ljc825  阅读(265)  评论(0编辑  收藏  举报

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