White Box Testing Techniques

Question 1

How is test coverage calculated?

Answer 1

Coverage = (No of coverage items exercised/ Total numbers of coverage items) x100%

Question 2

How would you measure test coverage?

Answer 2

• Determine the structural elements to be used
• Count the structural elements
• Instrument the code
• Execute the tests for measuring coverage
• Determine the percentage of elements exercised

Question 3

When can test coverage be measured?

Answer 3

• Component
• Integration
• System
• Acceptance testing

Question 4

Why is path coverage testing not always used?

Answer 4

Path coverage is the most comprehensive testing that a suite can provide, however:

• It is difficult and usually is reserved for critical sections of code
• 100% path coverage can be very time consuming

Question 5

What is experience-based testing also known as?

Answer 5

• Ad-hoc
• Reactive testing

Question 6

What are the two factors you should keep in mind when doing experience-based testing?

Answer 6

• Managing time and effort
• Tracking test coverage

Question 7

What types of error guessing techniques can be used?

Answer 7

• Extremely large input string
• Division by zero
• No input value
• Empty fields
• Wrong data

Question 8

What is exploratory testing?

Answer 8

This is an experience based testing technique. It is a combination of ad-hoc and structure-based testing.

Question 9

What factors should be considered when determing the technique or techniques used to test an application?

Answer 9

• The model used while developing the system
• Test objective
• Knowledge and experience of the tester
• Potential defects
• Documentation
• Life cycle model

Question 10

What external factors affect the choice of test technique?

Answer 10

• Risk
• Contractual requirements
• type of system
• regulatory requirements
• time and cost