ISTQB Sample Exam Questions – White Box Testing

Analyse the following highly simplified procedure:

Ask: “What type of ticket do you require, single or return?”
IF the customer wants ‘return’
Ask: “What rate, Standard or Cheap-day?”
IF the customer replies ‘Cheap-day’
Say: “That will be £11:20”
ELSE
Say: “That will be £19:50”
ENDIF
ELSE
Say: “That will be £9:75”
ENDIF

Now decide the minimum number of tests that are needed to ensure that all the questions have been asked, all combinations have occurred and all replies given.

Which of the following statements is NOT correct?

Which of the following is NOT a white box technique?

An important benefit of code inspections is that they:

Given the following code, which statement is true about the minimum number of test cases required for full statement and branch coverage?

Read p
Read q
IF p+q > 100 THEN
Print “Large”
ENDIF

IF p > 50 THEN
Print “p Large”
ENDIF

Consider the following statements:

i. 100% statement coverage guarantees 100% branch coverage.
ii. 100% branch coverage guarantees 100% statement coverage.
iii. 100% branch coverage guarantees 100% decision coverage.
iv. 100% decision coverage guarantees 100% branch coverage.
v. 100% statement coverage guarantees 100% decision coverage.

What can static analysis NOT find?

Which of the following techniques is NOT a black box technique?

If the pseudocode below were a programming language ,how many tests are required to achieve 100% statement coverage?

1. If x=3 then
2. Display_messageX;
3. If y=2 then
4. Display_messageY;
5. Else
6. Display_messageZ;
7. Else
8. Display_messageZ;

Which of the following tools would you use to detect a memory leak?

Incorrect form of Logic coverage is:

Which of the following is the odd one out?

Given the Following program

IF X < Y THEN Statement 1; ELSE IF Y >= Z
THEN Statement 2;
END

McCabe’s Cyclomatic Complexity is :

How many test cases are necessary to cover all the possible sequences of statements (paths) for the following program fragment? Assume that the two conditions are independent of each other : –

…………
if (Condition 1)
then statement 1
else statement 2
fi
if (Condition 2)
then statement 3
fi
…………

Given the following code, which statement is true about the minimum number of test cases required for full statement and branch coverage?

Read p
Read q
IF p+q > 100 THEN
Print “Large”
ENDIF
IF p > 50 THEN
Print “p Large”
ENDIF

Code Coverage is used as a measure of what?

Statement Coverage will not check for the following:

Consider the following statements:

i. 100% statement coverage guarantees 100% branch coverage.
ii. 100% branch coverage guarantees 100% statement coverage.
iii. 100% branch coverage guarantees 100% decision coverage.
iv. 100% decision coverage guarantees 100% branch coverage.
v. 100% statement coverage guarantees 100% decision coverage.

Unreachable code would best be found using: