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From: ojeda@kernel.org
To: "Miguel Ojeda" <ojeda@kernel.org>,
	"Wedson Almeida Filho" <wedsonaf@gmail.com>,
	"Alex Gaynor" <alex.gaynor@gmail.com>,
	"Boqun Feng" <boqun.feng@gmail.com>,
	"Gary Guo" <gary@garyguo.net>,
	"Björn Roy Baron" <bjorn3_gh@protonmail.com>
Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
	patches@lists.linux.dev, Milan Landaverde <milan@mdaverde.com>
Subject: [PATCH v2 18/28] rust: str: add `CStr` unit tests
Date: Fri,  2 Dec 2022 17:14:49 +0100	[thread overview]
Message-ID: <20221202161502.385525-19-ojeda@kernel.org> (raw)
In-Reply-To: <20221202161502.385525-1-ojeda@kernel.org>

From: Milan Landaverde <milan@mdaverde.com>

Add unit tests for `CStr::from_bytes_with_nul()` and
`CStr::from_bytes_with_nul_unchecked()`.

These serve as an example of the first unit tests for Rust code
(i.e. different from documentation tests).

Signed-off-by: Milan Landaverde <milan@mdaverde.com>
[Reworded, adapted for upstream and applied latest changes]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 rust/kernel/str.rs | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 11d297c1a61c..3ed685cb5a3c 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -321,6 +321,35 @@ where
     }
 }
 
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_cstr_to_str() {
+        let good_bytes = b"\xf0\x9f\xa6\x80\0";
+        let checked_cstr = CStr::from_bytes_with_nul(good_bytes).unwrap();
+        let checked_str = checked_cstr.to_str().unwrap();
+        assert_eq!(checked_str, "🦀");
+    }
+
+    #[test]
+    #[should_panic]
+    fn test_cstr_to_str_panic() {
+        let bad_bytes = b"\xc3\x28\0";
+        let checked_cstr = CStr::from_bytes_with_nul(bad_bytes).unwrap();
+        checked_cstr.to_str().unwrap();
+    }
+
+    #[test]
+    fn test_cstr_as_str_unchecked() {
+        let good_bytes = b"\xf0\x9f\x90\xA7\0";
+        let checked_cstr = CStr::from_bytes_with_nul(good_bytes).unwrap();
+        let unchecked_str = unsafe { checked_cstr.as_str_unchecked() };
+        assert_eq!(unchecked_str, "🐧");
+    }
+}
+
 /// Allows formatting of [`fmt::Arguments`] into a raw buffer.
 ///
 /// It does not fail if callers write past the end of the buffer so that they can calculate the
-- 
2.38.1


  parent reply	other threads:[~2022-12-02 16:16 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-02 16:14 [PATCH v2 00/28] Rust core additions ojeda
2022-12-02 16:14 ` [PATCH v2 01/28] rust: prelude: split re-exports into groups ojeda
2022-12-02 16:14 ` [PATCH v2 02/28] rust: print: add more `pr_*!` levels ojeda
2022-12-02 16:14 ` [PATCH v2 03/28] rust: print: add `pr_cont!` macro ojeda
2022-12-02 16:14 ` [PATCH v2 04/28] rust: samples: add `rust_print` example ojeda
2022-12-02 16:14 ` [PATCH v2 05/28] rust: macros: add `concat_idents!` proc macro ojeda
2022-12-04  0:20   ` Gary Guo
2022-12-02 16:14 ` [PATCH v2 06/28] rust: macros: add `#[vtable]` " ojeda
2022-12-06 12:49   ` Finn Behrens
2022-12-06 15:44     ` Miguel Ojeda
2022-12-02 16:14 ` [PATCH v2 07/28] rust: macros: take string literals in `module!` ojeda
2022-12-02 16:14 ` [PATCH v2 08/28] rust: error: declare errors using macro ojeda
2022-12-02 16:14 ` [PATCH v2 09/28] rust: error: add codes from `errno-base.h` ojeda
2022-12-06 12:52   ` Finn Behrens
2022-12-02 16:14 ` [PATCH v2 10/28] rust: error: add `From` implementations for `Error` ojeda
2022-12-02 16:14 ` [PATCH v2 11/28] rust: prelude: add `error::code::*` constant items ojeda
2022-12-02 16:14 ` [PATCH v2 12/28] rust: alloc: add `RawVec::try_with_capacity_in()` constructor ojeda
2022-12-02 16:14 ` [PATCH v2 13/28] rust: alloc: add `Vec::try_with_capacity{,_in}()` constructors ojeda
2022-12-06 12:55   ` Finn Behrens
2022-12-02 16:14 ` [PATCH v2 14/28] rust: str: add `BStr` type ojeda
2022-12-02 16:14 ` [PATCH v2 15/28] rust: str: add `b_str!` macro ojeda
2022-12-02 16:14 ` [PATCH v2 16/28] rust: str: add `CStr` type ojeda
2022-12-02 16:14 ` [PATCH v2 17/28] rust: str: implement several traits for `CStr` ojeda
2022-12-02 16:14 ` ojeda [this message]
2022-12-02 16:14 ` [PATCH v2 19/28] rust: str: add `c_str!` macro ojeda
2022-12-02 16:14 ` [PATCH v2 20/28] rust: str: add `Formatter` type ojeda
2022-12-04 15:41   ` Dr. David Alan Gilbert
2022-12-04 17:26     ` Wedson Almeida Filho
2022-12-04 18:05       ` Dr. David Alan Gilbert
2022-12-02 16:14 ` [PATCH v2 21/28] rust: str: add `CString` type ojeda
2022-12-02 16:14 ` [PATCH v2 22/28] rust: str: add `fmt!` macro ojeda
2022-12-02 16:14 ` [PATCH v2 23/28] rust: std_vendor: add `dbg!` macro based on `std`'s one ojeda
2022-12-02 16:14 ` [PATCH v2 24/28] rust: static_assert: add `static_assert!` macro ojeda
2022-12-02 16:14 ` [PATCH v2 25/28] rust: add `build_error` crate ojeda
2022-12-02 18:31   ` Wei Liu
2022-12-02 16:14 ` [PATCH v2 26/28] rust: build_assert: add `build_{error,assert}!` macros ojeda
2022-12-02 18:32   ` Wei Liu
2022-12-02 16:14 ` [PATCH v2 27/28] rust: types: add `Either` type ojeda
2022-12-02 23:41   ` Josh Triplett
2022-12-04  0:58     ` Miguel Ojeda
2022-12-04 10:31     ` Gary Guo
2022-12-04 17:36       ` Wedson Almeida Filho
2022-12-05 13:53         ` Miguel Ojeda
2022-12-05 23:00         ` Josh Triplett
2022-12-02 16:14 ` [PATCH v2 28/28] rust: types: add `Opaque` type ojeda
2022-12-04  1:05 ` [PATCH v2 00/28] Rust core additions Miguel Ojeda

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