Status code assertion in Postman - Cheat Sheet & Quick Revision

Recall & Review

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What is a status code assertion in API testing?

It is a check to confirm that the API response returns the expected HTTP status code, like 200 for success or 404 for not found.

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How do you write a status code assertion in Postman test scripts?

Use pm.response.to.have.status(expectedCode), for example: pm.response.to.have.status(200) checks if the response status is 200.

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Why is checking the status code important in API testing?

Because it quickly tells if the request was successful, failed, or if there was an error, helping to catch problems early.

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What does a 404 status code mean in API response?

It means the requested resource was not found on the server.

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Show a simple Postman test script to assert the status code is 201.

pm.test('Status code is 201', function () { pm.response.to.have.status(201); });

Which Postman method checks the response status code?

A pm.response.to.have.status()

B pm.request.to.have.status()

C pm.response.statusCode()

D pm.test.status()

pm.response.to.have.status() is the correct method to assert the response status code.

What does a 200 status code usually mean?

A Request successful

B Server error

C Resource not found

D Unauthorized access

200 means the request was successful and the server returned the expected response.

If you want to check that the API response status is 404, which assertion is correct?

A pm.response.to.have.status(200)

B pm.response.to.have.status(201)

C pm.response.to.have.status(500)

D pm.response.to.have.status(404)

404 means resource not found, so pm.response.to.have.status(404) is correct.

What happens if the status code assertion fails in Postman?

A Test passes silently

B Test fails and shows an error

C Postman crashes

D Status code changes automatically

If the assertion fails, Postman marks the test as failed and shows an error message.

Which status code indicates a successful resource creation?

A 200

B 400

C 201

D 404

201 means the resource was successfully created on the server.

Explain how to write a status code assertion in Postman and why it is useful.

Think about the Postman test script syntax and the purpose of status codes.

List common HTTP status codes you might assert in API testing and what they mean.

Focus on codes that indicate success, client error, and server error.