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本周的作業,是“軟體測試基礎”教材 ExerciseSection2.3 的課後習題。
題目要求,用下面的方法printPrimes()完成相應問題。 代碼如下:
/******************************************************* * 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
(a) 為printPrimes()方法畫控制流程圖。
(b) 考慮測試案例t1=(n=3)和t2=(n=5)。即使這些測試案例遊歷printPrimes()方法中相同的路徑,它們不一定找出相同的錯誤。設計一個簡單的錯誤,使得t2比t1更容易發現。
(c) 針對printPrimes(),找到一個測試案例,使得相應的測試路徑訪問串連while語句開始到for語句的邊,而不用通過while迴圈體。
(d) 針對printPrimes()的圖列舉每個節點覆蓋、邊覆蓋和主路徑覆蓋的測試需求。
首先,求解(a)。通過processon做出控制流程圖如下:
(b) 針對“數組越界”的錯誤,t2比t1更容易發現。
(c) 測試案例: n = 0 或 n = 1
(d) 點覆蓋: {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}
邊覆蓋: {(1,2),(2,3),(2,12),(3,4),(4,5),(5,6),(6,7),(6,8),(7,9),(8,5),(9,10),(9,11),(10,11),(11,2),(12,13),(13,14),(13,15),(14,13)}
主路徑覆蓋: {(1,2,3,4,5,6,7,9,10,11),
(1,2,3,4,5,6,7,9,11),
(1,2,3,4,5,6,8),
(1,2,3,4,5,9,10,11),
(1,2,3,4,5,9,11),
(1,2,12,13,14),
(1,2,12,13,15),
(2,3,4,5,6,7,9,10,11,2),
(2,3,4,5,6,7,9,11,2),
(2,3,4,5,9,10,11,2),
(2,3,4,5,9,11.2),
(3,4,5,6,7,9,10,11,2,12,13,14),
(3,4,5,6,7,9,11,2,12,13,14),
(3,4,5,6,7,9,10,11,2,12,13,15),
(3,4,5,6,7,9,11,2,12,13,15),
(3,4,5,9,10,11,2,12,13,14),
(3,4,5,9,11,2,12,13,14),
(3,4,5,9,10,11,2,12,13,15),
(3,4,5,9,11,2,12,13,15),
(5,6,8,5),
(6,8,5,9,10,11,2,12,13,14),
(6,8,5,9,10,11,2,12,13,15),
(6,8,5,9,11,2,12,13,14),
(6,8,5,9,11,2,12,13,15),
(13,14,13),
(14,13,15)}
現在,對具體代碼進行分析。代碼選擇上次測試三角形實驗的代碼。
該例子中,測試案例為:
(1.0, 1.0, 4.0), (10.0, 10.0, 10.0), (5.0, 5.0, 6.0), (3.0, 4.0, 5.0)
程式碼涵蓋範圍為100%,。
具體代碼已上傳github,連結:https://github.com/CindyZJT/lab1
軟體測試 HW4