Body validation before sending in Postman - Test Execution Trace

Test Overview

This test checks if the request body contains all required fields and valid data before sending the API request. It verifies that the body is correctly structured and prevents sending invalid data.

Test Code - Postman Test Script

Postman

pm.test("Request body has required fields and valid data", () => {
    const body = pm.request.body.raw ? JSON.parse(pm.request.body.raw) : {};
    pm.expect(body).to.have.property('username').that.is.a('string').and.is.not.empty;
    pm.expect(body).to.have.property('email').that.is.a('string').and.match(/^\S+@\S+\.\S+$/);
    pm.expect(body).to.have.property('age').that.is.a('number').and.is.above(0);
});

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test script starts and parses the request body JSON	Postman request body is available as raw JSON string	Check if body is parsed without error	PASS
2	Check if 'username' field exists, is a string, and not empty	Parsed body object with fields	'username' property exists and is a non-empty string	PASS
3	Check if 'email' field exists, is a string, and matches email pattern	Parsed body object with fields	'email' property exists and matches email regex	PASS
4	Check if 'age' field exists, is a number, and greater than 0	Parsed body object with fields	'age' property exists and is a positive number	PASS
5	All validations passed, request body is valid	Request ready to be sent with valid body	All previous assertions passed	PASS

Failure Scenario

Failing Condition: Request body is missing required fields or fields have invalid data

Execution Trace Quiz - 3 Questions

What does the test check first in the request body?

A If the response status is 200

B If the 'age' field is zero or negative

C If the 'username' field exists and is a non-empty string

D If the request headers are set

Key Result

Validating the request body before sending helps catch errors early and prevents sending bad data to the server, improving test reliability and API stability.