Why body format matches API expectations in Postman - Test Execution Impact

Test Overview

This test sends a POST request with a JSON body to an API endpoint. It verifies that the API accepts the body format and returns a success status code.

Test Code - Postman

Postman

pm.test("Body format matches API expectations", function () {
    const requestBody = {
        "username": "testuser",
        "password": "securePass123"
    };

    pm.sendRequest({
        url: pm.environment.get("apiUrl") + "/login",
        method: 'POST',
        header: {
            'Content-Type': 'application/json'
        },
        body: {
            mode: 'raw',
            raw: JSON.stringify(requestBody)
        }
    }, function (err, res) {
        pm.expect(err).to.be.null;
        pm.expect(res).to.have.property('status', 200);
        pm.expect(res.json()).to.have.property('token').that.is.a('string');
    });
});

Execution Trace - 7 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Postman test runner is ready	-	PASS
2	Prepare JSON body with username and password	Request body is set as JSON string	-	PASS
3	Send POST request to API endpoint /login with JSON body and Content-Type header	Request sent to server	-	PASS
4	Receive response from API	Response received with status code and JSON body	Check no error in request	PASS
5	Assert response status code is 200	Response status code is 200	Status code equals 200	PASS
6	Assert response JSON contains a token string	Response JSON has token property	Token property exists and is a string	PASS
7	Test ends with all assertions passed	Test report shows success	-	PASS

Failure Scenario

Failing Condition: API returns error status or missing token due to incorrect body format

Execution Trace Quiz - 3 Questions

What does the test verify about the API response?

A The API returns status code 404

B The API returns status code 200 and a token string

C The API returns an empty body

D The API returns status code 500

Key Result

Always ensure the request body format and Content-Type header match the API's expectations to avoid errors and get successful responses.