How To Structure A JMeter Test Plan Properly For A Scenario - Event "subscription"

- 1 answer

Scenario Outline

Test sends a REST API request to activate a game. Website receives a event and displays an alert on the browser.


Since I don't know when the event will be sent, do I need to run a WebSocket Sampler, or perhaps a WebSocket Single-Read Sampler, in a loop, until I get the matching message? So far in my attempts, I can connect to the event server and get message, but they are empty frames or messages are entirely different from the below.

I expect a message like this, which I am able to verify manually using the browser debugger.

    "locationId": 110,
    "name": "GAME_STARTED",           <---------------------
    "payload": {
        "id": 146418,
        "boxId": 2002,
        "userId": 419,
        "createdAt": "2022-02-17T09:10:16",
        "lastModifiedAt": "2022-02-17T09:10:22.189",
        "completedAt": "2022-02-17T09:10:22.07",
        "activationMethod": "TAG",
        "nfcTagId": "123423423412342134",
        "gameCount": 1,
        "app": false

Alternatively, would this work?

thread A:
open socket
while (true):
   read socket
   if message ~ 'GAME_STARTED':

thread B:
send HTTP REST API request   # triggers event to be sent

Here are the parameters used to connect and where I specify the response pattern, which needs wildcards or a JSON expression.

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You can consider using WebSocket Text Frame Filter

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If you add the filter configured like above it will remove all the frames which don't contain GAME_STARTED text so the WebSocket Single Read sampler will not "see" them, this way you can just have one sampler without any loops or other logic.

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