Add unit test for collapsing MR comments fix (#588444) · Issues · GitLab.org / GitLab · GitLab

Add unit test for collapsing MR comments fix

_This ticket was created from_ [_INC-7002_](https://app.incident.io/gitlab/incidents/7002) _using_ [_incident.io_](https://app.incident.io) 🔥

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