Setting variables in scripts in Postman - Test Execution Trace

Test Overview

This test checks if a variable is correctly set in a Postman script and then used in a subsequent request. It verifies that the variable value is stored and accessible.

Test Code - Postman

Postman

pm.test("Set and use environment variable", function () {
    pm.environment.set("userId", "12345");
    let userId = pm.environment.get("userId");
    pm.expect(userId).to.eql("12345");
});

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Postman test runner is ready to execute the script	-	PASS
2	Set environment variable 'userId' to '12345' using pm.environment.set	Environment variables now include userId = '12345'	-	PASS
3	Retrieve environment variable 'userId' using pm.environment.get	Variable userId retrieved with value '12345'	-	PASS
4	Assert that retrieved userId equals '12345' using pm.expect	Assertion compares expected '12345' with actual '12345'	pm.expect(userId).to.eql('12345')	PASS
5	Test ends successfully	Variable set and verified correctly	-	PASS

Failure Scenario

Failing Condition: Variable 'userId' is not set or has a different value than expected

Execution Trace Quiz - 3 Questions

What does pm.environment.set("userId", "12345") do in the script?

A Deletes the environment variable 'userId'

B Retrieves the value of 'userId' from environment variables

C Stores the value '12345' in the environment variable named 'userId'

D Runs a test to check if 'userId' equals '12345'

Key Result

Always verify that variables are set before using them in assertions to avoid undefined errors in Postman scripts.