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软件测试学习(4)

2016-03-25 21:42 218 查看
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

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