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Tutorial-7 To Generate Equivalence Class Test Cases-For the Next Date Function
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Tutorial-7 To Generate Equivalence Class Test Cases-For the Next Date Function

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Tutorial-7: To Generate Equivalence Class Test Cases-For the Next Date Function

"Next Date" is a function consisting of three variables like: month (mm), date (dd) and year (yyyy). It returns the date of next day as output. It reads current date as input date.

The conditions are

C1: 1 ≤ month ≤ 12
C2: 1 ≤ day ≤ 31
C3: 1812 ≤ year ≤ 2012

Thus based on valid values, the equivalence classes are:

M1= {month: 1 <- month <- 12}
D1 = {day: 1 <-day<<-31}
Y1= {year: 1812 <- year <- 2012}

And the invalid equivalence classes are:

M2 = {month : month < 1}
M3 = {month : month > 12}
D2 = {day : day < 1}
D3 = {day : day > 31}
Y2 = {year: year < 1812}
Y3 = {year : year > 2012}

Objective of this Tutorial: To apply the four techniques of equivalence class partitioning one by one & generate appropriate test cases?

color=#000080>1) & 2) Weak Normal & Strong Normal Equivalence Class: Since the number of valid classes equals the number of independent variables, only one weak normal equivalence class test case occurs and it is identical to the strong normal equivalence class test case WN1 & SN1

Test Case ID

Month (mm)

Day (dd)

Year (yyyy)

Expected Output

WN1, SN1

6

15

1912

6/16/1912

Hence we get the above test case on the basis of valid classes – M1, D1 and Y1 described above.

3) Weak Robust Equivalence Class: Test Cases falling under this category are as under

Test Case ID

Month (mm)

Day (dd)

Year (yyyy)

Expected Output

WR1

6

15

1912

6/16/1912

WR 2

-1

15

1912

Invalid Value of Month, as Month cannot be -ve

WR 3

13

15

1912

Invalid Value of Month, as Month is always < 12

WR 4

6

-1

1912

Invalid Value of Day, as Day cannot be -ve

WR 5

6

32

1912

Invalid Value of Day, as we cannot have 32 days in any month

WR 6

6

15

1811

Invalid Value of Year, as the rage is 1812 to 2012 only

WR 7

6

15

2013

Invalid Value of Year

Hence we get 7 test cases based on the valid and invalid classes of the input domain as described above.

4) Strong Robust Equivalence Class: Test Cases falling under this category are

Test Case ID

Month (mm)

Day (dd)

Year (yyyy)

Expected Output

SR1

-1

15

1912

Invalid Value of Month, as Month cannot be -ve

SR 2

6

-1

1912

Invalid Value of Day, as Day cannot be -ve

SR 3

6

15

1811

Invalid Value of Year

SR 4

-1

-1

1912

Invalid Value of Month & Day as Month & Day cannot be -ve

SR 5

6

-1

1811

Invalid Value of Day & Year

SR 6

-1

15

1811

Invalid Value of Month & Year

SR 7

-1

-1

1811

Invalid Value of Month, Day & Year

Modified Equivalence Class for this Problem

We need the modified classes as we know that at the end of a month, the next day is 1 and the month is incremented. At the end of a year, both the day and the month are reset to 1 and the year is also incremented. Finally, the problem of leap year makes determining the last day of a month interesting.

With all the above in mind, we describe the following equivalence classes

M1 = {month : month has 30 days}
M2 = {month : month has 31 days}
M3 = {month : month is February}
D1 = {day : 1 ≤ day ≤ 28}
D2 = {day : day = 29}
D3 = {day : day = 30}
D4 = {day : day = 31}
Y1 = {year :year = 2000}
Y2 = {year : year is a leap year}
Y3 = {year : year is a common year}

So, now let us again identify the various equivalence class test cases:

1) Weak Normal Equivalence Class:
As done earlier as well, the inputs are mechanically selected from the approximate middle of the corresponding class.

Test Case ID

Month (mm)

Day (dd)

Year (yyyy)

Expected Output

WN1

6

14

2000

6/15/2000

WN2

7

29

1996

7/30/1996

WN3

2

30

2002

2/31/2002 (Impossible)

WN4

6

31

2000

7/1/2000 (Impossible)

The random / mechanical selection of input values makes no consideration of our domain knowledge and thus we have two impossible dates. This will always be a problem with 'automatic' test case generation because all of our domain knowledge is not captured in the choice of equivalence classes.

2) Strong Normal Equivalence Class: The strong normal equivalence class test cases for the revised classes are:

Test Case ID

Month (mm)

Day (dd)

Year (yyyy)

Expected Output

SN1

6

14

2000

6/15/2000

SN2

6

14

1996

6/15/1996

SN3

6

14

2002

6/15/2002

SN4

6

29

2000

6/30/2000

SN5

6

29

1996

6/30/1996

SN6

6

29

2002

6/30/2002

SN7

6

30

2000

6/31/2000 (Impossible)

SN8

6

30

1996

6/31/1996 (Impossible)

SN9

6

30

2002

6/31/2002 (Impossible)

SN10

6

31

2000

7/1/2000 (Invalid Input)

SN11

6

31

1996

7/1/1996 (Invalid Input)

SN12

6

31

2002

7/1/2002 (Invalid Input)

SN13

7

14

2000

7/15/2000

SN14

7

14

1996

7/15/1996

SN15

7

14

2002

7/15/2002

SN16

7

29

2000

7/30/2000

SN17

7

29

1990

7/30/1996

SN18

7

29

2002

7/30/2002

SN19

7

30

2000

7/31/2000

SN20

7

30

1996

7/31/1996

SN21

7

30

2002

7/31/2002

SN22

7

31

2000

8/1/1996

SN23

7

31

1996

8/1/2000

SN24

7

31

2002

8/1/2002

SN25

2

14

2000

7/15/2000

SN26

2

14

1996

2/15/1996

SN27

2

14

2002

2/15/2002

SN28

2

29

2000

3/1/2000 (Invalid Input)

SN29

2

29

1996

3/1/1996

SN30

2

29

2002

3/1/2002 (Impossible Date)

SN31

2

30

2000

3/1/2000 (Impossible Date)

SN32

2

30

1996

3/1/1996 (Impossible Date)

SN33

2

30

2002

3/1/2002 (Impossible Date)

SN34

6

31

2000

7/1/2000 (Impossible Date)

SN35

6

31

1996

7/1/1996 (Impossible Date)

SN36

6

31

2002

3/1/2002 (Impossible Date)

So, three month classes, four day classes and three year classes results in 3 * 4 * 3 = 36 strong normal equivalence class test cases. Furthermore, adding two invalid classes for each variable will result in 150 strong robust equivalence class test cases.

It is quite difficult to describe all such 150 classes here.

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