I’m working on a Postman collection that includes various API requests and tests. The collection should pass several checks, including a specific skill check where I need to set a collection variable in the Tests tab script. However, I am encountering an error when running the tests.

The specific requirement for the test is:

6. [skillcheck] Set "favoriteActor" as a collection variable using 
   pm.collectionVariables.set(...) in the Tests tab script

And getting Postman Test Script Error: “Cannot read properties of undefined (reading ‘filter’)”

I’m getting an error when running my Postman collection:

{
    "status": "error",
    "message": "Your collection failed one or more Postman tests. See the errors array for details.",
    "errors": [
        {
            "test": "6. [skillcheck] Set "favoriteActor" as a collection variable using pm.collectionVariables set(...) in Tests tab script",
            "message": "Cannot read properties of undefined (reading 'filter')"
        }
    ]
}

Here is the relevant part of my test script:

pm.test(`6. [skillcheck] Set "favoriteActor" as a collection variable using pm.collectionVariables.set(...) in Tests tab script`, function () {
    pm.collectionVariables.set("favoriteActor", "Tony Stark");

    const favoriteActor = pm.collectionVariables.get("favoriteActor");
    pm.expect(favoriteActor).to.equal("Tony Stark");
});

I tried submitting the “Submit your Postman collection” for Postman API Fundamentals Student Expert certification and instead of getting this:

{

"status" : "ok", 

"message" : Congratulations! the lesson 'Submit your Postman collection' is now marked as complete."

}

I got an error as:

{
    "status": "error",
    "message": "Your collection failed one or more Postman tests. See the errors array for details.",
    "errors": [
        {
            "test": "6. [skillcheck] Set "favoriteActor" as a collection variable using pm.collectionVariables set(...) in  Tests tab script",
            "message": "Cannot read properties of undefined (reading 'filter')"
        }
    ]
}