AQA · GCSE · Computer Science · Higher

Boundary testing integer validation

Q03.2 2 marks

Figure 3

5	int userNumber = Convert.ToInt32(Console.ReadLine());
6	while (userNumber < 1 \|\| userNumber > 100)
7	{
8	Console.WriteLine("Invalid number");
9	userNumber = Convert.ToInt32(Console.ReadLine());
10	}
11	Console.WriteLine("Valid number entered");

Table 1

Test number	Test type	Test data	Expected result
[object Object]	[object Object]	[object Object]	[object Object]
[object Object]	[object Object]	[object Object]	[object Object]
[object Object]	[object Object]	[object Object]	[object Object]

Complete the test plan in Table 1 to test the validation of userNumber in the program in Figure 3.

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Marking points

1 Completes the erroneous expected result and supplies valid normal data.
2 Supplies one accepted boundary datum with its matching expected result; cross-paired values are not accepted.

Full-mark answer

Test 1 expected result: Invalid number. Test 2 boundary example: test data 0 with expected result Invalid number. Test 3 normal test data: 50.

Why this answer loses marks

I chose a boundary value but paired it with the result from the wrong side of the valid range.

A boundary test only works when the datum and its expected valid or invalid outcome agree.