Mock vs stub comparison in Postman - Quick Revision & Key Differences

Recall & Review

beginner

What is a stub in software testing?

A stub is a simple fake component that returns predefined responses to calls during testing. It helps isolate the part being tested by simulating dependent parts.

beginner

What is a mock in software testing?

A mock is a fake object that not only returns predefined responses but also records how it was used, allowing verification of interactions during tests.

intermediate

How does a mock differ from a stub?

A stub provides fixed responses without tracking usage, while a mock tracks how it was called and can verify if expected interactions happened.

beginner

In Postman, what is the purpose of a mock server?

A Postman mock server simulates an API by returning predefined responses to requests, helping test clients without needing the real API.

beginner

Why might you use a stub instead of a mock in testing?

You use a stub when you only need to provide simple fixed responses and don't need to check how the fake was used.

Which of the following best describes a stub?

A A fake that records how it was called for verification

B A fake that returns fixed responses without tracking calls

C A real component used in testing

D A tool to generate test reports

A stub returns predefined responses but does not track how it was called.

What extra feature does a mock have compared to a stub?

A It records and verifies interactions

B It can simulate network delays

C It generates random data

D It runs tests automatically

Mocks record how they are used and allow verification of interactions.

In Postman, what is the main use of a mock server?

A To store test data

B To generate documentation

C To simulate API responses without the real API

D To run automated tests

Postman mock servers simulate API responses for testing without needing the real API.

When should you prefer a stub over a mock?

A When you need to verify method calls

B When testing UI components

C When running performance tests

D When you only need fixed responses without interaction checks

Stubs are used when only fixed responses are needed, without verifying interactions.

Which statement is true about mocks and stubs?

A Mocks can verify interactions, stubs cannot

B Stubs track how they are called

C Mocks are simpler than stubs

D Stubs are used only in Postman

Mocks can verify interactions, while stubs only provide fixed responses.

Explain the difference between a mock and a stub in simple terms.

Think about whether the fake just replies or also remembers how it was used.

Describe how Postman mock servers help in API testing.

Imagine testing an app before the real API is ready.