use addReply funtion to build the expected state

[kanake10]

Goal

Ensure test consistency by updating onCommentAdded test cases to use the existing addReply logic.

Implementation

Updated onCommentAdded tests to use addReply for consistency

Testing

Confirmed that reply counts and lists are correctly updated when adding replies.

Ensured non-reply comments are ignored as expected.

Checklist

• No Issue linked (if any)
• CommentReplyListStateImplTest updated
• I have signed the Stream CLA (required for external contributors)

[github-actions]

PR checklist ❌

The following issues were detected:

• Missing required label: at least one label starting with pr:.

What we check

1. Title is concise (5–18 words) unless labeled pr:ignore-for-release.
2. At least one pr: label exists (e.g., pr:bug, pr:new-feature).
3. Sections ### Goal, ### Implementation, and ### Testing contain content.

[gpunto]

Instead of using production code to build the expected result, we usually favor stating it explicitly. Otherwise, if the addReply function has a bug, we would not catch it. This is why replies and replyCount were set explicitly.

[kanake10]

Got it, will close this PR

[kanake10]

@gpunto
question not related to this PR: in the demo app, are those features (like loading feed or posting an activity) only accessible to users registered in the backend?

[gpunto]

@gpunto question not related to this PR: in the demo app, are those features (like loading feed or posting an activity) only accessible to users registered in the backend?

Yes, we only support the users hardcoded in the app for the time being.