linux-kernel - Re: [PATCH v2 2/3] rust: macros: add macro to easily run KUnit tests

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Message-ID: <ZyDUsFaZt2WViQL8@boqun-archlinux>
Date: Tue, 29 Oct 2024 05:27:28 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: David Gow <davidgow@...gle.com>
Cc: Miguel Ojeda <ojeda@...nel.org>,
	José Expósito <jose.exposito89@...il.com>,
	Brendan Higgins <brendan.higgins@...ux.dev>,
	Rae Moar <rmoar@...gle.com>, Alex Gaynor <alex.gaynor@...il.com>,
	Gary Guo <gary@...yguo.net>, Benno Lossin <benno.lossin@...ton.me>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Matt Gilbride <mattgilbride@...gle.com>, kunit-dev@...glegroups.com,
	linux-kselftest@...r.kernel.org, rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] rust: macros: add macro to easily run KUnit tests

Hi David,

On Tue, Oct 29, 2024 at 05:24:18PM +0800, David Gow wrote:
> From: José Expósito <jose.exposito89@...il.com>
> 
> Add a new procedural macro (`#[kunit_tests(kunit_test_suit_name)]`) to
> run KUnit tests using a user-space like syntax.
> 
> The macro, that should be used on modules, transforms every `#[test]`
> in a `kunit_case!` and adds a `kunit_unsafe_test_suite!` registering
> all of them.
> 
> The only difference with user-space tests is that instead of using
> `#[cfg(test)]`, `#[kunit_tests(kunit_test_suit_name)]` is used.
> 
> Note that `#[cfg(CONFIG_KUNIT)]` is added so the test module is not
> compiled when `CONFIG_KUNIT` is set to `n`.
> 
> Reviewed-by: David Gow <davidgow@...gle.com>
> Signed-off-by: José Expósito <jose.exposito89@...il.com>
> [Updated to use new const fn.]
> Signed-off-by: David Gow <davidgow@...gle.com>
> ---
> 
> Changes since v1:
> https://lore.kernel.org/lkml/20230720-rustbind-v1-2-c80db349e3b5@google.com/
> - Rebased on top of rust-next
> - Make use of the new const functions, rather than the kunit_case!()
>   macro.
> 
> ---
>  MAINTAINERS          |  1 +
>  rust/kernel/kunit.rs | 11 +++++++++++
>  rust/macros/lib.rs   | 29 +++++++++++++++++++++++++++++
>  3 files changed, 41 insertions(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index b77f4495dcf4..b65035ede675 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12433,6 +12433,7 @@ F:	Documentation/dev-tools/kunit/
>  F:	include/kunit/
>  F:	lib/kunit/
>  F:	rust/kernel/kunit.rs
> +F:	rust/macros/kunit.rs

I cannot find this file in this series, and it's not in the current
rust-next either.

(Did you do the same thing as I sometimes did: forget to `git add` a new
file?)

Regards,
Boqun

>  F:	scripts/rustdoc_test_*
>  F:	tools/testing/kunit/
>  
> diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs
> index fc2d259db458..abcf0229ffee 100644
> --- a/rust/kernel/kunit.rs
> +++ b/rust/kernel/kunit.rs
> @@ -40,6 +40,8 @@ pub fn info(args: fmt::Arguments<'_>) {
>      }
>  }
>  
> +use macros::kunit_tests;
> +
>  /// Asserts that a boolean expression is `true` at runtime.
>  ///
>  /// Public but hidden since it should only be used from generated tests.
> @@ -269,3 +271,12 @@ macro_rules! kunit_unsafe_test_suite {
>          };
>      };
>  }
> +
> +#[kunit_tests(rust_kernel_kunit)]
> +mod tests {
> +    #[test]
> +    fn rust_test_kunit_kunit_tests() {
> +        let running = true;
> +        assert_eq!(running, true);
> +    }
> +}
> diff --git a/rust/macros/lib.rs b/rust/macros/lib.rs
> index 939ae00b723a..098925b99982 100644
> --- a/rust/macros/lib.rs
> +++ b/rust/macros/lib.rs
> @@ -10,6 +10,7 @@
>  mod quote;
>  mod concat_idents;
>  mod helpers;
> +mod kunit;
>  mod module;
>  mod paste;
>  mod pin_data;
> @@ -430,3 +431,31 @@ pub fn paste(input: TokenStream) -> TokenStream {
>  pub fn derive_zeroable(input: TokenStream) -> TokenStream {
>      zeroable::derive(input)
>  }
> +
> +/// Registers a KUnit test suite and its test cases using a user-space like syntax.
> +///
> +/// This macro should be used on modules. If `CONFIG_KUNIT` (in `.config`) is `n`, the target module
> +/// is ignored.
> +///
> +/// # Examples
> +///
> +/// ```ignore
> +/// # use macros::kunit_tests;
> +///
> +/// #[kunit_tests(kunit_test_suit_name)]
> +/// mod tests {
> +///     #[test]
> +///     fn foo() {
> +///         assert_eq!(1, 1);
> +///     }
> +///
> +///     #[test]
> +///     fn bar() {
> +///         assert_eq!(2, 2);
> +///     }
> +/// }
> +/// ```
> +#[proc_macro_attribute]
> +pub fn kunit_tests(attr: TokenStream, ts: TokenStream) -> TokenStream {
> +    kunit::kunit_tests(attr, ts)
> +}
> -- 
> 2.47.0.163.g1226f6d8fa-goog
> 
>