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CHAPTER 13 Object-Oriented Testing
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void add(int s, int u){x=s;y=u;} }; class B { A* w[MAX]; int z; int q; public: B() {z=0; q =1;} int Bread(){cin>>s>>u; if (z= MAX) return 0; if(s<q){w[z]=new A; w[z]->add(s,u);} else {w[z]=new C; w[z]->add(u,s);w[z]->Atadd(s);} z++; return z;} int Ba(int s){q=w[s]->Aa(q); return q;} }; class C public A{ int t; public: int Aa(int r) {cout<<t; return m->Da(t);} void Atadd(int x) {t = x;} }; Regular expressions of each function with function calls in its body: class D Da : (Db | Dc) class A A: D Aa: Da class B Bread: e | (A add | C add Atadd) Ba : Aa class C C: A Aa: Da Regular expression for possible calls: B (Bread (e | A D add | C A D add Atadd)) | Ba Aa Da (Db | Dc))* The function pair coverage must include the following pairs: B Bread Bread A Bread C Bread Bread B Ba Da Db add Bread add Ba Da Dc Atadd Bread Atadd Ba Db Ba Db Bread Dc Bread Dc Ba
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Object-Oriented Testing
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1. How is functional testing of object-oriented software done 2. Is statement coverage of object-oriented software useful 3. Does MM testing subsume statement coverage (See Section 10.3.1.) 4. What is the advantage of function pair coverage
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1. Given the following code, generate test cases that satisfy the criteria of MM testing and every function pair testing: class Threes { char cout; public: Threes(){count = a ;} void PlusOne(){ if(count == a ) count = b ; if(count == b ) count = c ; if(count == c ) count = a ; } char* IsDiv() {if(count == a ){return yes ;}else{return no ;}} } class Num { Threes* SumMod3; int last; int number; void Digit(int newnum){int j; for (j=1; j<=newnum; j++) SumMod3->PlusOne();} public: Num(){SumMod3 = new Threes;} void Reduce() {while (number > 0){last = number (number/ 10)*10; Digit(last); number = number/10;} char* IsDivisibleBy3(int newnum) {number = newnum; Reduce; return SumMod3->IsDiv();} } Main() { Num* Test = new Num; int value; char* answer; cin >> value; answer = test->IsDivisibleBy3(value); cout << answer;
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CHAPTER 13 Object-Oriented Testing
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1. How is functional testing of object-oriented software done Functional testing of object-oriented software is no di erent from functional testing of conventional software. 2. Is statement coverage of object-oriented software useful Yes, statement coverage of object-oriented software should be done. It is probably the most minimal acceptable coverage. 3. Does MM testing subsume statement coverage (See Section 10.3.1.) No, MM testing requires that every method call be tested. However, a section of source code could not contain any method calls and thus not be tested by a set of test cases that achieve MM testing. 4. What is the advantage of function pair coverage Function pair coverage ensures that combinations of calls be executed. In the stack example (13.3), if the stack is called by an user interface, there may be only one call of each function. Thus, a simple sequence of create, push, and pop might achieve MM testing. Function pair coverage subsumes MM testing.
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Answers to Problems
1. Given the following code, generate test cases that satisfy the criteria of MM testing and every function pair testing: class Threes { char cout; public: Threes(){count = a ;} void PlusOne(){ if(count == a ) count = b ; if(count == b ) count = c ; if(count == c ) count = a ; } char* IsDiv() {if(count == a ){return yes ;}else{return no ;}} } class Num { Threes* SumMod3; int last; int number;
Object-Oriented Testing
void Digit(int newnum){int j; for (j=1; j<=newnum; j++) SumMod3->PlusOne();} public: Num(){SumMod3 = new Threes;} void Reduce() {while (number > 0){last = number (number/ 10)*10; Digit(last); number = number/10;} char* IsDivisibleBy3(int newnum) {number = newnum; Reduce; return SumMod3->IsDiv();} } Main() { Num* Test = new Num; int value; char* answer; cin >> value; answer = test->IsDivisibleBy3(value); cout << answer; Regular expressions of calls: main: Num IsDivisibleBy3 Num: Threes Reduce: Digit * IsDivisibleBy3: Reduce IsDiv Digit: PlusOne* Threes: PlusOne: IsDiv MM testing: The test set must execute all calls. One test case, input 5 output no, should execute all. Every function pair: The test set must have a test for each IsDiv transition, so inputs 6 and 7 should achieve coverage. The outputs are yes and no, respectively.
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