STM-Problems-2003

8/7/2019 STM-Problems-2003

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STM Practice Sessions


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1. Boundary Value Analysis

Question

X Company has a following unique rules for selection of employees.

The employee age should be >=18 and


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Answer A

Boundary Age Education Marks

LB 18 16 61

LB+1 19 17 62MV 35 20 75

UB-1 55 24 88

UB 56 25 89

LB-1 17 15 60

UB+1 57 26 90


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Answer B

No of tests casesBVA= 4(3)+1=13

Robust BVA=6(3)+1=19

Worst case BVA=5^3=125

Robust worst case BVA=7^3=343


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Answer C:Robust BVATest Case # Age Education Mark

1 35 20 75

2 18 20 75

3 19 20 75

4 55 20 75

5 56 20 75

6 17 20 75

7 57 20 75

8 35 16 75

9 35 17 75

10 35 24 75

11 35 25 75

12 35 15 7513 35 26 75

14 35 20 61

15 35 20 62

16 35 20 88

17 35 20 89

18 35 20 60

19 35 20 90


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2. White Box testing- Graph

Identify the cyclomatic complexity of the

Graph

Indentify Number of unique paths


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Answer:

edges and node method

e = 22, n = 15v = 22 -15 +2

v = 9

P1=1-2-4-6-7-8-9-11-13-14-15

P2=1-2-3-6-7-8-9-11-13-14-15

P3=1-2-5-6-7-8-9-11-13-14-15

P4=1-2-5-2-4-6-7-8-9-11-13-14-15

P5=1-2-4-6-7-2-4-6-7-8-9-11-13-14-15

P6=1-2-4-6-7-8-9-11-13-14-9-11-13-14-15P7=1-2-4-6-7-8-9-10-13-14-15

P8=1-2-4-6-7-8-9-10-12-13-14-15

P9=1-2-4-6-7-8-9-10-12-9-11-13-14-15


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3. White Box testing

ReturnAverage() /* Design Test cases ..*/public static double ReturnAverage(int value[], int AS, int MIN, int MAX){

/* Function: ReturnAverage Computes the average of all those numbers in the input arrayinthe positive range [MIN, MAX]. The maximum size of the array is AS. But, the arraysizecould be smaller than AS in which case the end of input is represented by -999. */

int i, ti, tv, sum;double av;i = 0; ti = 0; tv = 0; sum = 0;while (ti < AS && value[i] != -999) {

ti++;if (value[i] >= MIN && value[i] 0)

av = (double)sum/tv;elseav = (double) -999;

return (av);}


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Decision Table- Exercise

Company X sells merchandise to wholesale and retail outlets.

Wholesale customers receive a two percent discount on allorders. The company also encourages both wholesale and

retail customers to pay cash on delivery by offering a two

percent discount for this method of payment. Another two

percent discount is given on orders of 50 or more units. Each

column represents a certain type of order.


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Solution


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Decision Table- 2

Pizza name type Personal

Price

Medium

Price

Family

price

Zesty chicken Non veg 85 170 320

Veg Supreme Veg 205 340 530

Chicken italia Non Veg 205 340 530

A pizza company has launched a new restaurant and developed a software

to take care of their billing needs. Following are the menu they have in their

restaurant

The customers can be pure vegetarian, mixed (veg+non veg) consumer

If the value of bill is more than Rs 500 in an order the customer is eligible

for a free desert

Customer can order 1 pizza in a bill, All prices includes taxes

The software should give the bill value and whether the customer iseligible for free desert


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Solution sample

parameter values Number of Values 1 2 3

customer type Veg,Mixed 2 veg veg veg

Pizza order vsup,fchic,zchic 3 zchic zchic zchic

sizepersonal,medium,fa

mily 3 personal medium family


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Variable x

De

f

Us

e

1

2

3

1: Input(x)

2: Input(y)

3: if x < 10 then4: y := y + 2

5: else

6: x:= x+1

7: end if

8: if y > 20 then9: y := y +1;

10: end if

11: Write(x,y)

12: end

4. Data Flow Testing- Design DU Table


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Answer : DU table for x & y

Variable x

De

f

Us

e

1 1 3

2 1 11

3 6 11

Variable y

De

f

Us

e

1 2 8

2 2 113 4 8

4 4 11

5 9 11


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5. Data Flow Testing: Design DU table

Variable: r0, r1, r2, r3, a[]

1 void sort(int n, int a[])

{ int r0, r1, r2, r3;

2 r3 = 0;

3 r1 = 0 ;

4 while (r1


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Variable r0 Variable r3

Def Use Def Use

1 5 9 5 7 15

2 5 14 6 11 15

3 10 9

4 10 14Variable r1 Variable r2

Def Use Def Use

7 3 4 21 6 8

8 3 5 22 6 9

9 3 6 23 6 10

10 3 7 24 6 11

11 3 13 25 6 12

12 3 14 26 12 8

13 3 16 27 12 914 16 4 28 12 10

15 16 5 29 12 11

16 16 6 30 12 12

17 16 7 31 13 15

18 16 13

19 16 14

20 16 16

Variable a[] Variable n

Def Use Def Use32 1 5 40 1 4

33 1 9 41 1 8

34 1 10

35 1 13

36 15 5

37 15 9

38 15 10

39 15 13

Answer


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6. Exercise: Design Test cases for the following problem

(Decision Table-Cause & Effect)

Indian income tax department has changed the tax policy

and released a new application for you to test

Following are the business rules:No tax till 1,50,0000

10 per cent for 150,000 to 300,000,

20 per cent for 300,001 to 500,000 and

30 per cent for above 500,001For women, the non taxable limit is Rs 1.80 lakh

For senior citizens, non taxable limit is Rs 2.25 lakh.


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Solution sample

IS Male Y,N Y Y Y Y Y

Senior

Citizen Y,N Y Y Y Y Y

SalaryRange 150K,180K,225K,300K,500K 150k 180k 225k 300k 500k

20

Expected

result

No tax

10%

20%

30%


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Special value testing?

1.Experience really helps

2.Frequently done by the customer or user

3.Defies measurement

4.Highly intuitive

5.Seldom repeatable

6.Often, very effective

Advantages:

1.Complex mathematical (or algorithmic) calculations

2.Worst Case situations (similar to robustness)

3.Problematic situations from past experience4.Second guess the likely implementation


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Slice based Testing

The idea of slices is to separate a program

into components that have some useful

meaning


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Slice based testing

Given a program P, and a program graph G(P)

in which statements and statement fragments

are numbered, and a set V of variables in P,

the slice on the variable set V at statement

fragment n, written S(V,n), is the set node

numbers of all statement fragments in P prior

to n that contribute to the values of variablesin V at statement fragment n


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Number of Test Coverage Items

low

high

Sophistication

DU-Path

DD-Path

BasisPath

Slice


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Effor o den fy Tes Coverage Ite s

o

hgh

ophstication

-

ath

-

ath

asis

Path

ice

STM-Problems-2003

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