To test the functionality of the new WebSockets from the client's perspective, it is necessary to write tests that verify the following behaviours:

1. Happy path for creating and subscribing to any topic.
   The test should include checks for a successful subscription response and receiving the expected results from the subscription.

2. Error case for subscription when the client attempts to subscribe with incorrect data.

3. Happy path for unsubscribing from a topic.

4. Error case for the unsubscribing when the client provides an incorrect subscription ID.

5. Retrieving a list of all subscriptions.

6. Checking the tracking of client inactivity and connection loss.