Condition block in Postman - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Postman test script?

Consider this Postman test script that checks the response status code and sets a variable accordingly. What will be the value of the variable testResult after running this script if the response status code is 404?

Postman

if (pm.response.code === 200) {
    pm.variables.set('testResult', 'Success');
} else if (pm.response.code === 404) {
    pm.variables.set('testResult', 'Not Found');
} else {
    pm.variables.set('testResult', 'Other Error');
}

A "Not Found"

B undefined

C "Other Error"

D "Success"

💡 Hint

Check the condition that matches the response code 404.

The script checks if the response code is 200, then 404, else sets 'Other Error'. Since the response code is 404, the variable 'testResult' is set to 'Not Found'.

❓ assertion

intermediate

Which assertion correctly tests if the response JSON has a key 'status' with value 'ok'?

You want to write a Postman test that asserts the JSON response has a key status equal to ok. Which option is the correct assertion?

A pm.test('Status is ok', () => { pm.expect(pm.response.json().status).to.be.undefined; });

B pm.test('Status is ok', () => { pm.expect(pm.response.json().status).to.eql('ok'); });

C pm.test('Status is ok', () => { pm.expect(pm.response.json().status).to.be.true; });

D pm.test('Status is ok', () => { pm.expect(pm.response.json().status).to.be.null; });

💡 Hint

Check which assertion compares the value exactly to 'ok'.

Option B correctly asserts that the 'status' key equals the string 'ok'. Other options check for boolean true, undefined, or null which are incorrect.

🔧 Debug

advanced

Why does this Postman test script fail to set the variable correctly?

This script is intended to set the variable result to 'Passed' if the response code is 201, but it never sets it. What is the error?

Postman

if (pm.response.code = 201) {
    pm.variables.set('result', 'Passed');
} else {
    pm.variables.set('result', 'Failed');
}

A The single '=' is an assignment, should be '===' for comparison.

B The variable 'result' is not declared before setting.

C pm.variables.set cannot be used inside if blocks.

D The response code should be accessed with pm.response.statusCode.

💡 Hint

Check the operator used in the if condition.

Using '=' assigns 201 to pm.response.code instead of comparing. The correct operator for comparison is '==='.

❓ framework

advanced

Which Postman test script correctly uses a condition block to check multiple response codes?

You want to write a Postman test that passes if the response code is 200 or 201, and fails otherwise. Which script correctly implements this?

A pm.test('Status is 200 or 201', () => { if (pm.response.code === 200 || pm.response.code === 201) { pm.expect(true).to.be.true; } else { pm.expect.fail('Unexpected status code'); } });

B pm.test('Status is 200 or 201', () => { pm.expect(pm.response.code === 200 || 201).to.be.true; });

C pm.test('Status is 200 or 201', () => { if (pm.response.code === 200 && pm.response.code === 201) { pm.expect(true).to.be.true; } else { pm.expect.fail('Unexpected status code'); } });

D pm.test('Status is 200 or 201', () => { pm.expect(pm.response.code).to.be.oneOf([200, 201]); });

💡 Hint

Check how to test if a value is one of multiple options.

Option D uses the built-in 'oneOf' assertion to check if the response code is either 200 or 201. Option D works but is more verbose. Option D has a logic error, and C uses '&&' which can never be true.

🧠 Conceptual

expert

What is the main advantage of using condition blocks in Postman test scripts?

Why do testers use condition blocks (like if-else) in Postman test scripts when validating API responses?

A To speed up the API response time by skipping some requests.

B To automatically generate API documentation from test scripts.

C To execute different test assertions based on varying response data or status codes.

D To encrypt sensitive data in the response before testing.

💡 Hint

Think about how tests adapt to different responses.

Condition blocks allow tests to adapt and check different scenarios depending on the response, making tests flexible and meaningful.