# What this PR does
Fix [flaky
test](https://github.com/grafana/oncall/actions/runs/4821277510/jobs/8586941639#step:5:706)
`test_get_user_groups_filter_by_handle` using `UniqueFaker` on
`SlackUserGroupFactory.handle` to make handles always unique.
Before:
```shell
>>> len(set([SlackUserGroupFactory().handle for _ in range(100)]))
93
```
After:
```shell
>>> len(set([SlackUserGroupFactory().handle for _ in range(100)]))
100
```
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
e7950139f3