9618 · 12.3

Program Testing and Maintenance — practice questions

Practice and worked examples for 9618 Program Testing and Maintenance. Short previews only — attempt the full question in MarkScheme against the official scheme.

Worked example 1

A program includes a function CheckDiscount(Age) that returns TRUE if a person is eligible for a discount and FALSE otherwise. The discount is available for ages 18 to 25 inclusive. Complete a test plan with four distinct test cases for this function.

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Here is a sample test plan. Note the justification for each data choice.

Test Case	Test Data (Age)	Type of Data	Expected Outcome	Actual Outcome	Justification
1	20	Normal	TRUE		A typical valid age within the range.
---	---	---	---	---
2	18	Boundary	TRUE		The lowest valid value in the range.
3	26	Boundary	FALSE		The first invalid value just above the upper limit.
4	'nineteen'	Abnormal	Error message / FALSE		Data of the wrong type (string instead of integer).

Worked example 2

A procedure CalculateGrade(Score) is designed to work with integer scores from 0 to 100. Create a test plan with five test cases to check its robustness.

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The goal is to test the input validation and handling of edge cases.

Test Case	Test Data (Score)	Type of Data	Expected Outcome	Actual Outcome	Justification
1	75	Normal	Grade 'A' (or similar valid output)		A standard, valid score in the middle of the range.
---	---	---	---	---
2	0	Boundary	Grade 'F' (or lowest valid grade)		The lowest possible valid score.
3	100	Boundary	Grade 'A+' (or highest valid grade)		The highest possible valid score.
4	101	Boundary	Error message or rejection		The first integer value just outside the valid upper boundary.
5	-1	Boundary	Error message or rejection		The first integer value just outside the valid lower boundary.

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