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1. Calculate the Chidamber metrics for the code from the problem statement that maintains an array of people/students. Metric 1: Weighted Methods per Class
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Class person student personlist # Methods 6 2 4
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Note that the inherited functions were not counted. WMC 12=3 4 methods=class Metric 2: Depth of Inheritance Tree (DIT)
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Class person student personlist DIT 0 1 0
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Object-Oriented Metrics
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Metric 3: Number of Children (NOC)
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Class person student personlist
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NOC 1 0 0
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Metric 4: Coupling between Object Classes (CBO) See Fig. 12-4.
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personlist
person
addPerson addStudent display
student
addName addSsn getName display
addGpa display
Fig. 12-4
The class diagram is annotated with arrows to show which functions (or constructors) are called by each function (only calls in other classes are shown).
Class person student personlist
Coupled Classes student, personlist person, personlist person, student
CBO 2 2 2
CHAPTER 12 Object-Oriented Metrics
Metric 5: Response for a Class (RFC)
Class person student personlist
Response Set person, addName, addSssm getName, display student, addGpa, person, getName personlist, addPerson, addStudent, addName, addSsn, addGpa, display
RFC 5 6 7
Metric 6: Lack of Cohesion in Methods (LCOM) See Fig. 12-5.
name ssn
addName addSsn
addGpa gpa display
AM FL Y
getName display list listIndex
addPerson
addStudent display
Fig. 12-5
Class person student personlist
LCOM max(0,(8 5 5 0 max(0,(2 2 2 0 max(0,(6 6 6 0
Object-Oriented Testing
13.1 Introduction
Testing object-oriented software presents some new challenges. Many conventional techniques are still appropriate. For example, functional testing of objectoriented software will be no di erent from functional testing of conventional software. Test cases will be developed based on the required functionality as described in the requirement documentation. However, structural testing of object-oriented software will be very di erent. Two structural testing approaches will be covered: MM testing and function pair testing
Conventional Software
The testing of conventional software is often based on coverage criteria de ned on the structure of the software. The standard approaches (see 10) include statement coverage, branch coverage, and data ow coverage. These coverage criteria are based on the control ow diagram or a modi ed control ow diagram.
Object-Oriented Software
Object-oriented software adds a new complexity to software testing. The control ow diagram is no longer a good representation of the structure of the software. It would be more appropriate to base structural testing on an object model. However, no e ective coverage measures of object models have been found. The methods in the class should be tested with the techniques already presented. The same coverage criteria can be applied to object-oriented software. Intuitively, however, the statement and branch coverage criteria do not seem appropriate for thoroughly testing the complexities of object-oriented software. The interactions between methods need to be tested. One approach to object-oriented testing is to cover all the calls to methods. This is sometimes called MM testing.
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CHAPTER 13 Object-Oriented Testing
MM Testing
The MM testing (method-message) coverage requires that every method call be tested. Thus, in every method, every call to another method must be tested at least once. If a method calls another method multiple times, each calls needs to be tested only once. This seems to be the most basic coverage criterion. The MM testing does not subsume every-statement coverage (see Section 10.3.1).
EXAMPLE 13.1
Identify the MM testing coverage for the linked list of rectangles problem. class point { oat x; oat y; public: point( oat newx, oat newy) {x=newx; y=newy;} getx(){return x;} gety(){return y;} }; class rectangle { point pt1, pt2, pt3, pt4; public: rectangle( oat pt1x, pt1y, pt2x, pt2y, pt3x, pt3y, pt4x, pt4y) { pt1 = new point(pt1x, pt1y); pt2 = new point(pt2x, pt2y); pt3 = new point(pt3x, pt3y); pt4 = new point(pt4x, pt4y);} oat length(point r, point s){return sqrt((r.getx()-s.getx())^2+ (r.gety()-s.gety())^2); } oat area(){return length(pt1,pt2) * length(pt1,pt3);} }; class linklistnode { rectangle* node; linklistnode* next; public: linklistnode(rectangle* newRectangle){node=newRectangle; next=0;} linklistnode* getNext(){return next;} rectangle* getRectangle(){return node;} void setnext(linklistnode* newnext){next=newnext;} }; class rectanglelist { linklistnode* top; public: rectanglelist(){top = 0;} void addRectangle( oat x1, y1, x2, y2, x3, y3, x4, y4) { linklistnode* tempLinkListNode; rectangle* tempRectangle; tempRectangle = new rectangle(x1,y1,x2,y2,x3,y3,x4,y4); tempLinkListNode = new linkListNode(tempRectangle); tempLinkListNode->setnext(top); top=tempLinkListNode; } oat totalArea(){ oat sum; sum=0; linklistnode* temp; temp=top; while (temp !=0){sum=sum + temp->getRectangle()->area(); temp=temp->getNext();} return sum;} };
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