Variable assignment in flows in Postman - Test Execution Trace

Test Overview

This test checks if a variable is correctly assigned and updated during a Postman request flow. It verifies that the variable value changes as expected after the request runs.

Test Code - Postman

Postman

pm.test("Variable assignment in flow", function () {
    // Assign initial value to variable
    pm.variables.set("counter", 1);

    // Simulate flow: increment variable
    let currentValue = pm.variables.get("counter");
    pm.variables.set("counter", currentValue + 1);

    // Verify variable updated correctly
    pm.expect(pm.variables.get("counter")).to.eql(2);
});

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Postman test environment initialized	-	PASS
2	Assign initial value 1 to variable 'counter' using pm.variables.set	Variable 'counter' set to 1 in local scope	-	PASS
3	Retrieve current value of 'counter' using pm.variables.get	Variable 'counter' value is 1	-	PASS
4	Increment 'counter' by 1 and assign back using pm.variables.set	Variable 'counter' updated to 2	-	PASS
5	Assert that 'counter' equals 2 using pm.expect	Variable 'counter' value is 2	pm.expect(pm.variables.get("counter")).to.eql(2)	PASS

Failure Scenario

Failing Condition: Variable 'counter' is not updated correctly and remains 1 or undefined

Execution Trace Quiz - 3 Questions

What does pm.variables.set("counter", 1) do in the test?

A Reads the value of 'counter'

B Assigns the value 1 to the variable 'counter' in the current scope

C Deletes the variable 'counter'

D Sends a request to update 'counter'

Key Result

Always verify that variables are correctly assigned and updated in your test flow to avoid false test passes or failures.