Generating dynamic data in Postman - Test Execution Trace

Test Overview

This test sends a POST request with dynamic user data generated at runtime. It verifies that the API responds with a success status and the correct user name in the response.

Test Code - Postman Test Script

Postman

pm.test("Create user with dynamic data", function () {
    // Generate dynamic user data
    const randomId = Math.floor(Math.random() * 10000);
    const userName = `user_${randomId}`;
    
    // Set request body with dynamic data
    pm.request.body.update({
        mode: 'raw',
        raw: JSON.stringify({
            name: userName,
            email: `${userName}@example.com`
        })
    });

    // Send the request
    pm.sendRequest(pm.request, function (err, res) {
        pm.expect(err).to.be.null;
        pm.expect(res).to.have.property('status', 201);
        const jsonData = res.json();
        pm.expect(jsonData.name).to.eql(userName);
    });
});

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts and generates a random user ID	Random number generated, userName variable set to 'user_<randomId>'	-	PASS
2	Updates the request body with dynamic userName and email	Request body now contains JSON with dynamic name and email	-	PASS
3	Sends POST request to create user with dynamic data	Request sent to API endpoint	-	PASS
4	Receives response and checks for no error and status code 201	Response received with status code 201	Assert err is null and response status is 201	PASS
5	Parses response JSON and verifies returned user name matches dynamic userName	Response JSON contains user data	Assert response JSON name equals generated userName	PASS

Failure Scenario

Failing Condition: API returns error or status code other than 201, or returned user name does not match dynamic data

Execution Trace Quiz - 3 Questions

What does the test verify after sending the POST request?

A The request body is empty

B The API returns status code 404

C The API returns status code 201 and the user name matches the dynamic data

D The user name is always 'user_1234'

Key Result

Generating dynamic data in tests helps avoid conflicts and makes tests more reliable by simulating real-world unique inputs.