The release of Nushell 1.103.0 came with support for attributes such as @test and @before-each (see the release notes for this feature), which clearly a nicer way to declare test commands. This release of Nutest adds support for this method, while preserving the previous comment style #[test] for now, though that will be removed in a future release.
This release of Nutest necessarily requires Nushell 0.103.0.