Question

1 Consider a program for the determination of Previous date. Its input is a triple of day, month and year with the values in the range

1 ≤ month ≤ 12

1 ≤ day ≤ 31

2000 ≤ year ≤ 2125

The possible outputs are “Previous date” and “Invalid input date”.

Design the test cases using the following:

1. [50 Marks] Decision table-based testing.
2. [50 Marks] Design the worst-case testing.

Show the full details to apply the testing part

Answer 1

Scenario given for testing:

Consider a program for the determination of Previous date. Its input is a triple of day, month and year with the values in the range

1 ≤ month ≤ 12

1 ≤ day ≤ 31

2000 ≤ year ≤ 2125

The possible outputs are “Previous date” and “Invalid input date”.

1] Decision table-based testing.

Decision table built in this testing method is a tabular representation of inputs versus rules/cases/test conditions.

Conditions	Rule 1	Rule 2	Rule 3	Rule 4	Rule 5	Rule 6	Rule 7	Rule 8
Day (T/F)	F	F	F	F	T	T	T	T
Month (T/F)	F	F	T	T	F	F	T	T
Year (T/F)	F	T	F	T	F	T	F	T
OUTPUT (P/I)	I	I	I	I	I	I	I	P

Legend:

T - Correct Input in given range (Day/Month/Year)

F - Wrong Input in given range (Day/Month/Year)

P - Previous Date (Expected output)

I - Invalid Input Date (Error message)

Interpretation:

Rule-8: Enter valid day, month, year and the expected result will be the user should get the previous date.

Rule-1 to Rule-7: Enter invalid day- month-year(one/two/all three invalid input) and the expected result will be the user should get an error message 'Invalid input date'.

2] Worst case testing

Here we consider cases where more than 1 variable has extreme values.

i.e.

1) Range: 1 ≤ month ≤ 12

In these test-cases, month variable can be given values 1, 2, 12, 11

(

minimum value in range - 1

close to minimum value in range - 2

maximum value in range - 12

close to maximum value in range - 11

)

2) Range: 1 ≤ day ≤ 31

day variable can be given values 1, 2, 31, 30

(

minimum value in range - 1

close to minimum value in range - 2

maximum value in range - 31

close to maximum value in range - 30

)

3) Range: 2000 ≤ year ≤ 2125

year variable can be given values 2000, 2001, 2125, 2124

(

minimum value in range - 2000

close to minimum value in range - 2001

maximum value in range - 2125

close to maximum value in range - 2124

)

These values can be used to set up the test cases for worst case testing.