Software Testing Week 4 NPTEL Assignment Answers 2025

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✅ Subject: Software Testing
📅 Week: 4
🎯 Session: NPTEL 2025 July-October
🔗 Course Link: Click Here
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NPTEL Software Testing Week 4 Assignment Answers 2025

1. Which of the following best describes a test driver?

• It is a special purpose implementation of a software module, used to develop or test a component that calls it.
• It is a software component that replaces another component that takes care of the control and/or the calling of a software component.

Answer : See Answers

2. If method A uses a variable v shared with method B, where A writes to v and B reads from v, then, it is an example of which kind of coupling interface listed below?

• Parameter coupling.
• Interface coupling.
• External coupling.
• Shared data coupling.

Answer :

3. To test sequencing constraints that occur as requirements specification, which of the following tests are used?

• Tests are inputs to sequencing constraints that violate the constraints.
• Tests are inputs to sequencing constraints that satisfy the constraints.
• Tests are sequences of method calls, as they occur in the specification.
• Tests are randomly generated sequencing constraints.

Answer :

4. A simple path from the last definition to the first use of a coupling variable is called as . . . . . . . . ..

• A du-path.
• A coupling du-path.

Answer :

5. State Yes or No: Are control flow graphs representing code the same as finite state machines that represent the same code?

• Yes
• No

Answer :

Consider the graph below that depicts the calls to file handler methods open(), close(),read() and write(). Any procedure/method that uses these methods has to satisfy the following sequencing constraints: (1) An open(f) must be executed before every write(t), (2) An open(f) must be executed before every close(), (3) A write(f) may not be executed after a close() unless there is an open(f) in between, (4) A write(t) should be executed before every close().

Answer the following questions with reference to the sequencing constraints and the graph a method that uses these constraints.

6. Which of the following is true with reference to the graph satisfying the sequencing constraints?

• All the sequencing constraints are satisfied.
• Constraints (1) and (2) are satisfied but (3) and (4) are not.
• Constraints (1), (2) and (3) are satisfied but (4) is not.
• All constraints are violated.

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7. State true or false: The path (1,4,5,7) satisfies constraint (4).

• True.
• False.

Answer :

8. State true or false: The path (1,2,3,7) satisfies all the constraints.

• True.
• False.

Answer :

9. State yes or no: Does the path (1,4,6,7) violate any of the constraints?

• Yes.
• No.

Answer :

10. State true or false: The path (1,4,6,4,6,7) satisfies all the constraints.

• Yes.
• No.

Answer : See Answers