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The Tokio runtime provides a "shell" runtime when `rt-core` is not available. This shell runtime is enough to support `#[tokio::main`] and `#[tokio::test]. A previous change disabled these two attr macros when `rt-core` was not selected. This patch fixes this by re-enabling the `main` and `test` attr macros without `rt-core` and adds some integration tests to prevent future regressions.