ISTQB Software Testing Quiz 4

1. We split testing into distinct stages (or test levels) primarily because:

Each test stage has a different purpose.

It is easier to manage testing in stages.

We can run different tests in different environments.

The more stages we have, the better the testing.

I hope this answer is obvious. B might be true, C isn't relevant, and D is debatable. The reason we have stages like component testing, integration testing, system testing and acceptance testing is because they have different purposes.

Explanation

I hope this answer is obvious. B might be true, C isn't relevant, and D is debatable. The reason we have stages like component testing, integration testing, system testing and acceptance testing is because they have different purposes.

2. Which one of the following statements about system testing is not true?

System tests are often performed by independent teams.

Functional testing is used more than structural testing.

Faults found during system tests can be very expensive to fix.

End-users should be involved in system tests.

System testing involves testing an integrated system to verify that it meets specified requirements. We don't usually include the end-users in this; they become involved during acceptance testing instead.

Explanation

System testing involves testing an integrated system to verify that it meets specified requirements. We don't usually include the end-users in this; they become involved during acceptance testing instead.

3. Error guessing:

Supplements formal test design techniques.

Can only be used in component, integration and system testing.

Is only performed in user acceptance testing.

Is not repeatable and should not be used.

Error guessing is clearly a useful technique and by process of elimination, the correct answer should be easy to find.

Explanation

Error guessing is clearly a useful technique and by process of elimination, the correct answer should be easy to find.

4. Analyse the following simplified airline booking procedure:

Ask: "What type of ticket would you like, one-way or return?"
IF customer wants return THEN
    Ask: "What class would you like, business or economy?"
    IF customer wants economy THEN
        Say: "That will be $1,200"
    ELSE
        Say: "That will be $4,000"
    ENDIF
ELSE
    Say: "That will be $600 for one way economy, there is no business class available"
ENDIF What is the minimum number of tests needed to ensure that all:
    - questions have been asked;
    - combinations have occurred; and
    - all replies have been given?

3

4

5

6

This looks like a decision coverage question, and I've found that the easiest way to work out decision coverage for a code fragment is to draw a simple flowchart and count the number of paths through it.

Explanation

This looks like a decision coverage question, and I've found that the easiest way to work out decision coverage for a code fragment is to draw a simple flowchart and count the number of paths through it.

5. Which of the following is true of the V-model?

It states that modules are tested against user requirements.

It only models the testing phase.

It specifies the test techniques to be used.

It includes the verification of designs.

This is a "process of elimination" question.

Explanation

This is a "process of elimination" question.

6. Which of the following is not true of test coverage criteria?

Test coverage criteria can be measured in terms of items exercised by a test suite.

A measure of test coverage criteria is the percentage of user requirements covered.

A measure of test coverage criteria is the percentage of faults found.

Test coverage criteria are often used when specifying test completion criteria.

This should be an obvious answer, because "coverage" always relates to how much we have tested (not how many faults we have found).

Explanation

This should be an obvious answer, because "coverage" always relates to how much we have tested (not how many faults we have found).