Condition block in Postman - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Condition block in Postman tests?

A Condition block is a part of the test script where you check if something is true or false, like checking if a response status is 200. It helps decide what to do next based on the result.

beginner

How do you write a simple condition block to check if the response status is 200 in Postman?

Use an if statement like:

if (pm.response.code === 200) { pm.test('Status is 200', () => { pm.expect(pm.response.code).to.equal(200); }); }

beginner

Why are condition blocks useful in Postman tests?

They let you run tests only when certain things happen, like testing a feature only if the previous request succeeded. This saves time and makes tests smarter.

beginner

What happens if the condition in a Postman condition block is false?

The code inside the block does not run. This means the test inside won’t execute, so you can control which tests run based on conditions.

intermediate

Show an example of using an else block in Postman test scripts.

Example:

if (pm.response.code === 200) { pm.test('Success', () => { pm.expect(true).to.be.true; }); } else { pm.test('Failure', () => { pm.expect.fail('Response was not 200'); }); }

What does a condition block in Postman test scripts do?

A Runs code only if a condition is true

B Runs code regardless of any condition

C Deletes the response data

D Sends a new request automatically

A condition block runs the code inside it only when the condition is true, helping control test flow.

Which JavaScript keyword is used to start a condition block in Postman tests?

A if

B for

C while

D switch

The 'if' keyword starts a condition block to check if a condition is true.

What will happen if the condition in an if block is false in Postman test scripts?

A The test always passes

B The code inside the block runs

C Postman crashes

D The code inside the block does not run

If the condition is false, the code inside the if block does not run.

How can you test for a response status of 200 using a condition block in Postman?

A pm.test('Status is 200')

B if (pm.response.code === 200) { pm.test(...) }

C pm.response.code = 200

D pm.expect(200).to.equal(pm.response.code)

Using if (pm.response.code === 200) lets you run tests only when the status is 200.

What is the purpose of an else block in Postman test scripts?

A To stop the test execution

B To repeat the if block

C To run code when the if condition is false

D To send another request

An else block runs code when the if condition is false, allowing alternative actions.

Explain how a condition block works in Postman test scripts and why it is useful.

Think about checking response status before running tests.

Write a simple Postman test script using a condition block to check if the response status is 200 and explain each part.

Start with if, then pm.test inside, then pm.expect to check status.

Practice

1. What is the main purpose of a condition block in Postman tests?

easy

A. To send multiple requests at once

B. To run code only when a specific condition is true

C. To store variables permanently

D. To format the response body

Solution

1. Step 1: Understand the role of condition blocks

   Condition blocks like if let you run code only when certain conditions are met.

2. Step 2: Compare with other options

   Sending requests, storing variables, or formatting responses are different features, not condition blocks.

3. Final Answer:

   To run code only when a specific condition is true -> Option B

4. Quick Check:

   Condition block = run code if true [OK]

Hint: Condition blocks run code only if conditions are true [OK]

Common Mistakes:

• Confusing condition blocks with request sending
• Thinking condition blocks store variables
• Assuming condition blocks format responses

2. Which of the following is the correct syntax for a condition block in Postman test scripts?

easy

A. check (pm.response.code === 200) { console.log('Success'); }

B. when (pm.response.code == 200) { console.log('Success'); }

C. if pm.response.code = 200 then { console.log('Success'); }

D. if (pm.response.code === 200) { console.log('Success'); }

Solution

1. Step 1: Identify correct JavaScript condition syntax

   Postman test scripts use JavaScript, so if (condition) { } is correct syntax.

2. Step 2: Check each option

   if (pm.response.code === 200) { console.log('Success'); } uses correct if with triple equals and braces. Others use invalid keywords or assignment instead of comparison.

3. Final Answer:

   if (pm.response.code === 200) { console.log('Success'); } -> Option D

4. Quick Check:

   Use if (condition) { } in Postman [OK]

Hint: Use JavaScript if (condition) { } syntax [OK]

Common Mistakes:

• Using wrong keywords like 'when' or 'check'
• Using single equals '=' instead of '==' or '==='
• Missing parentheses or braces

3. Given this Postman test script snippet:

if (pm.response.code === 404) {
    pm.test('Not Found', () => {
        pm.expect(pm.response.code).to.equal(404);
    });
} else {
    pm.test('Other status', () => {
        pm.expect(pm.response.code).to.not.equal(404);
    });
}

What test will run if the response code is 200?

medium

A. 'Not Found' test runs and passes

B. Both tests run and fail

C. 'Other status' test runs and passes

D. No tests run

Solution

1. Step 1: Analyze the condition with response code 200

   The if checks if code is 404; 200 is not 404, so else block runs.

2. Step 2: Identify which test runs in else block

   The else block runs a test named 'Other status' that expects code not to be 404, which is true for 200.

3. Final Answer:

   'Other status' test runs and passes -> Option C

4. Quick Check:

   Response 200 triggers else block test [OK]

Hint: If condition false, else block runs test [OK]

Common Mistakes:

• Assuming 'Not Found' test runs for 200
• Thinking both tests run simultaneously
• Believing no test runs if condition false

4. Identify the error in this Postman test script condition block:

if pm.response.code == 200 {
    pm.test('Status is 200', () => {
        pm.expect(pm.response.code).to.equal(200);
    });
}

medium

A. Missing parentheses around the condition

B. Using double equals instead of triple equals

C. Missing semicolon after pm.test

D. Incorrect function arrow syntax

Solution

1. Step 1: Check syntax of the if statement

   JavaScript requires parentheses around the condition in if, but here they are missing.

2. Step 2: Verify other syntax elements

   Double equals is allowed in JS, semicolon after pm.test is optional, and arrow function syntax is correct.

3. Final Answer:

   Missing parentheses around the condition -> Option A

4. Quick Check:

   Always use parentheses in if (condition) [OK]

Hint: Always wrap condition in parentheses in if statements [OK]

Common Mistakes:

• Omitting parentheses around condition
• Confusing == and === as syntax errors
• Expecting semicolons after function calls

5. You want to write a Postman test that checks if the response JSON has a status field equal to 'success'. If true, test should pass with message 'Success status'. Otherwise, it should fail with message 'Status not success'. Which condition block correctly implements this?

hard

A. if (pm.response.json().status === 'success') {
pm.test('Success status', () => {
pm.expect(true).to.be.true;
});
} else {
pm.test('Status not success', () => {
pm.expect.fail('Status not success');
});
}

B. if pm.response.json().status = 'success' {
pm.test('Success status', () => {
pm.expect(true).to.be.true;
});
} else {
pm.test('Status not success', () => {
pm.expect.fail('Status not success');
});
}

C. if (pm.response.json().status == 'success') {
pm.test('Success status', () => {
pm.expect(false).to.be.true;
});
} else {
pm.test('Status not success', () => {
pm.expect.fail('Status not success');
});
}

D. if (pm.response.json().status === 'success') {
pm.test('Success status', () => {
pm.expect.fail('Status not success');
});
} else {
pm.test('Status not success', () => {
pm.expect(true).to.be.true;
});
}

Solution

1. Step 1: Check condition syntax and comparison

   Correct syntax requires if (pm.response.json().status === 'success') with parentheses, strict equality ===, and proper JSON access. Other options lack parens, use assignment, wrong expectations, or swapped logic.

2. Step 2: Verify test pass/fail logic

   If true, pm.test('Success status', () => { pm.expect(true).to.be.true; }) passes. Else, pm.test('Status not success', () => { pm.expect.fail('Status not success'); }) fails with message.

3. Final Answer:

   if (pm.response.json().status === 'success') { pm.test('Success status', () => { pm.expect(true).to.be.true; }); } else { pm.test('Status not success', () => { pm.expect.fail('Status not success'); }); } -> Option A

4. Quick Check:

   Use strict equality and fail test in else block [OK]

Hint: Use if (condition) { pass } else { fail } pattern [OK]

Common Mistakes:

• Using single equals '=' instead of '==='
• Failing test inside success block
• Passing test inside failure block