A test against a string passes regardless of the value

Question

This test pm.expect(jsonData.payload.invitationStatus == "A"); works regardless of the value that invitationStatus actually contains.

i.e. payload.invitationStatus = E will pass in the test.

How do I get this to pass only if the value is A?

Here are a couple of examples of the payload:

{
    "payload": {
        "buyer": "",
        "error": "E",
        "invitationStatus": "E",
        "supplier": "",
        "terms": ""
    }
}

{
    "payload": {
        "buyer": "omitted omitted",
        "error": "S",
        "invitationStatus": "A",
        "supplier": "ABC Supplier",
        "terms": ""
    }
}

Here's the test itself:

// Setters
let jsonData = JSON.parse(responseBody);

// Testers
pm.test("Status code is 200", function () {
    pm.response.to.have.status(200);
});
pm.test("Invitation status is A", function () {
    if(jsonData.payload) {
        pm.expect(jsonData.payload.invitationStatus == "A");
    } else {
        throw new Error("Unexpected structure");
    }
});

Answer 1

I'm not sure why the == didn't work but this worked pm.expect(jsonData.payload.invitationStatus).to.eql("A");

Here's a good resource for other postman tests examples https://www.getpostman.com/docs/v6/postman/scripts/test_examples