软件测试，Homework3
题目
private 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 primes.
// 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; i++ ) {
//for each previous prime.
if(isDvisible(primes[i],curPrime)) {
//Found a divisor, curPrime is not prime.
isPrime = false;
break;
}
}
if(isPrime) {
// save it!
primes[numPrimes] = curPrime;
numPrimes++;
}
}// End while
// print all the primes out
for(int i = 0; i < numPrimes; i++) {
System.out.println("Prime: " + primes[i] );
}
}// End printPrimes.a)Draw the control flow graph for the printPrimes() method.
b)Consider test cases t1 = (n = 3) and t2 = (n = 5).Although these tour the same prime paths in printPrimes(), they do not necessarily find the same faults.Design a simple fault that t2 would be more likely to discover than t1 would.
c)For printPrimes(),find a test case such that the corresponding test path visits the edge that connects the beginning of the while statement to the for statement without going through the body of the while loop.
d)Enumerate the test requirements for node coverage, edge coverage, and prime path coverage for the graph for printPrimes().
解答
The control flow graph
Design a simple fault
MAXPRIMES = 4 的时候，test case t2 会发生数组越界，而test case t1 不会。
Find the test case
test case t3 = (n = 1)
Node coverage, edge coverage, and prime path coverage for the graph
- Node coverage
TR = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}
Test Paths: [1,2,3,4,5,6,7,5,6,8,9,10,2,11,12,13,14,15]
- Edge coverage
TR = {(1,2) , (2,3) , (2,11) , (3,4) , (4,5) , (5,6) , (5,9) , (6,7) , (6,8) , (7,5) , (8,9) , (9,2) , (9,10) , (10,2) , (11,12),(12,13) , (12,15) , (13,14) , (14,12)}
Test Paths: [1, 2, 3, 4, 5, 6, 7, 5, 6, 8, 9, 10, 2, 11, 12, 13, 14, 12, 15 ], [1, 2, 3, 4, 5, 9, 2, 11, 12, 15 ]
- Prime Path coverage
TR = {[5,6,7,5] , [6,7,5,6] , [7,5,6,7] , [12,13,14,12] , [13,14,12,13] , [13,14,12,15] , [14,12,13,14] ,
[1,2,11,12,15] ,
[2,3,4,5,6,7] , [2,3,4,5,9,2] , [3,4,5,9,2,3] , [4,5,9,2,3,4] , [5,9,2,3,4,5] , [9,2,3,4,5,9] ,
[1,2,3,4,5,6,7] , [1,2,3,4,5,9,10] , [1,2,11,12,13,14,15] , [2,3,4,5,9,10,2] , [3,4,5,9,10,2,3] , [4,5,9,10,2,3,4] , [5,9,10,2,3,4,5] , [9,10,2,3,4,5,9] , [10,2,3,4,5,9,10] ,
[1,2,11,12,13,14,12,15] , [2,3,4,5,6,8,9,2] , [3,4,5,6,8,9,2,3] , [3,4,5,9,2,11,12,15] , [4,5,6,8,9,2,3,4] , [5,6,8,9,2,3,4,5] , [6,7,5,9,2,11,12,15] , [6,8,9,2,3,4,5,6] ,
[8,9,2,3,4,5,6,8] , [9,2,3,4,5,6,8,9] ,
[1,2,3,4,5,6,8,9,10] , [2,3,4,5,6,8,9,10,2] , [3,4,5,6,8,9,10,2,3] , [3,4,5,9,10,2,11,12,15] , [4,5,6,8,9,10,2,3,4] , [5,6,8,9,10,2,3,4,5] , [6,7,5,9,10,2,11,12,15] ,
[6,8,9,10,2,3,4,5,6] , [8,9,10,2,3,4,5,6,8] , [9,10,2,3,4,5,6,8,9] , [10,2,3,4,5,6,8,9,10] ,
[3,4,5,6,8,9,10,11,12,15] ,
[3,4,5,6,8,9,10,2,11,12,15] , [3,4,5,9,2,11,12,13,14,12,15] , [6,7,5,9,2,11,12,13,14,12,15] ,
[3,4,5,9,10,2,11,12,13,14,12,15] , [6,7,5,9,10,2,11,12,13,14,12,15] ,
[3,4,5,6,8,9,2,11,12,13,14,12,15] ,
[3,4,5,6,8,9,10,2,11,12,13,14,12,15]}
Test Paths: [ 1, 2, 11, 12, 15 ]
[ 1, 2, 11, 12, 13, 14, 15 ]
[ 1, 2, 11, 12, 13, 14, 12, 15 ]
[ 1, 2, 3, 4, 5, 6, 7, 5, 6, 7, 5, 6, 8, 9, 2, 3, 4, 5, 9, 10, 2, 3, 4, 5, 9, 2, 3, 4, 5, 9, 2, 11, 12, 13, 14, 12, 15 ]
[ 1, 2, 3, 4, 5, 9, 10, 2, 3, 4, 5, 6, 8, 9, 10, 2, 3, 4, 5, 9, 2, 11, 12, 15 ]
[ 1, 2, 3, 4, 5, 6, 8, 9, 2, 3, 4, 5, 6, 8, 9, 10, 2, 3, 4, 5, 9, 10, 2, 11, 12, 15 ]
[1, 2, 3, 4, 5, 6, 8, 9, 10, 2, 3, 4, 5, 6, 8, 9, 10, 2, 3, 4, 5, 6, 7, 5, 9, 2, 11, 12, 13, 14, 12, 15
基于Junit及Eclemma（jacoco）实现一个主路径覆盖的测试
- 被测试类接口，Judgeinter.java
package judge;
public interface Judgeinter {
/**
*
* @param a
* @param b
* @param c
* @return 等边三角形；等腰三角形；普通三角形;不构成三角形
*/
String get_re();
}- 被测试类， Judge.java
package judge;
public class Judge implements Judgeinter {
int a,b,c;
String re = "";
public Judge(int i, int j, int k) {
// TODO Auto-generated constructor stub
this.a = i;
this.b = j;
this.c = k;
}
/* (non-Javadoc)
* @see judge.Judgeinter#judgetri(int, int, int)
*/
private int judgetri() {
if (a+b > c && a-b < c) {
if (a == b & b == c & c ==a ) {
return 1;
}else if (a == b || a == c || b == c) {
return 2;
}else {
return 3;
}
}else {
return -1;
}
}
private void set_re() {
int single = judgetri();
if (single == 1 ) {
re = "等边三角形";
} else if (single == 2) {
re = "等腰三角形";
} else if (single == 3){
re = "普通三角形";
} else if (single == -1) {
re = "不是三角形";
} else {
try {
throw new Exception();
} catch (Exception e) {
// TODO Auto-generated catch block
System.out.println("错误，无法判断！");
e.printStackTrace();
}
}
}
public String get_re() {
set_re();
return re;
}
}- 测试类，JudgeTest.java
package judge;
public class Judge implements Judgeinter {
int a,b,c;
String re = "";
public Judge(int i, int j, int k) {
// TODO Auto-generated constructor stub
this.a = i;
this.b = j;
this.c = k;
}
/* (non-Javadoc)
* @see judge.Judgeinter#judgetri(int, int, int)
*/
private int judgetri() {
if (a+b > c && a-b < c) {
if (a == b & b == c & c ==a ) {
return 1;
}else if (a == b || a == c || b == c) {
return 2;
}else {
return 3;
}
}else {
return -1;
}
}
private void set_re() {
int single = judgetri();
if (single == 1 ) {
re = "等边三角形";
} else if (single == 2) {
re = "等腰三角形";
} else if (single == 3){
re = "普通三角形";
} else if (single == -1) {
re = "不是三角形";
} else {
try {
throw new Exception();
} catch (Exception e) {
// TODO Auto-generated catch block
System.out.println("错误，无法判断！");
e.printStackTrace();
}
}
}
public String get_re() {
set_re();
return re;
}
}
JudgeTest.java
package Test;
import static org.junit.Assert.assertEquals;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import judge.Judge;
class JudgeTest {
@BeforeEach
void setUp() throws Exception {
System.out.println("测试开始");
}
@Test
void test1() {
Judge judge = new Judge(3,2,5);
String result = judge.get_re();
System.out.println(result);
assertEquals("不是三角形",result);
}
@Test
void test2() {
Judge judge = new Judge(2,3,4);
String result = judge.get_re();
System.out.println(result);
assertEquals("普通三角形",result);
}
@Test
void test3() {
Judge judge = new Judge(5,5,3);
String result = judge.get_re();
System.out.println(result);
assertEquals("等腰三角形",result);
}
@Test
void test4() {
Judge judge = new Judge(6,6,6);
String result = judge.get_re();
System.out.println(result);
assertEquals("等边三角形",result);
}
@Test
void test5() {
Judge judge = new Judge(4,2,3);
String result = judge.get_re();
System.out.println(result);
assertEquals("不是三角形",result);
}
}- 结果。
