[Test] spec/lib/gitlab/themes_spec.rb | Gitlab::Themes.default prevents an infinite loop when configuration default is invalid
### Test metadata (don't modify)
| Field | Value |
| ------ | ------ |
| File URL | [`spec/lib/gitlab/themes_spec.rb#L29`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/spec/lib/gitlab/themes_spec.rb#L29) |
| Filename | `spec/lib/gitlab/themes_spec.rb` |
| Description | `Gitlab::Themes.default prevents an infinite loop when configuration default is invalid` |
| Test level | unit |
| Hash | `48b9b529ea045b696c3f1988466f4a7d262b21f19` |
| Reference duration | 0.16 seconds |
| Expected duration | < 27.12 seconds |
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