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Diffstat (limited to 'rust/kernel/kunit.rs')
| -rw-r--r-- | rust/kernel/kunit.rs | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs index 824da0e9738a..1604fb6a5b1b 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. @@ -161,3 +163,172 @@ macro_rules! kunit_assert_eq { $crate::kunit_assert!($name, $file, $diff, $left == $right); }}; } + +/// Represents an individual test case. +/// +/// The [`kunit_unsafe_test_suite!`] macro expects a NULL-terminated list of valid test cases. +/// Use [`kunit_case_null`] to generate such a delimiter. +#[doc(hidden)] +pub const fn kunit_case( + name: &'static kernel::str::CStr, + run_case: unsafe extern "C" fn(*mut kernel::bindings::kunit), +) -> kernel::bindings::kunit_case { + kernel::bindings::kunit_case { + run_case: Some(run_case), + name: name.as_char_ptr(), + attr: kernel::bindings::kunit_attributes { + speed: kernel::bindings::kunit_speed_KUNIT_SPEED_NORMAL, + }, + generate_params: None, + status: kernel::bindings::kunit_status_KUNIT_SUCCESS, + module_name: core::ptr::null_mut(), + log: core::ptr::null_mut(), + } +} + +/// Represents the NULL test case delimiter. +/// +/// The [`kunit_unsafe_test_suite!`] macro expects a NULL-terminated list of test cases. This +/// function returns such a delimiter. +#[doc(hidden)] +pub const fn kunit_case_null() -> kernel::bindings::kunit_case { + kernel::bindings::kunit_case { + run_case: None, + name: core::ptr::null_mut(), + generate_params: None, + attr: kernel::bindings::kunit_attributes { + speed: kernel::bindings::kunit_speed_KUNIT_SPEED_NORMAL, + }, + status: kernel::bindings::kunit_status_KUNIT_SUCCESS, + module_name: core::ptr::null_mut(), + log: core::ptr::null_mut(), + } +} + +/// Registers a KUnit test suite. +/// +/// # Safety +/// +/// `test_cases` must be a NULL terminated array of valid test cases, +/// whose lifetime is at least that of the test suite (i.e., static). +/// +/// # Examples +/// +/// ```ignore +/// extern "C" fn test_fn(_test: *mut kernel::bindings::kunit) { +/// let actual = 1 + 1; +/// let expected = 2; +/// assert_eq!(actual, expected); +/// } +/// +/// static mut KUNIT_TEST_CASES: [kernel::bindings::kunit_case; 2] = [ +/// kernel::kunit::kunit_case(kernel::c_str!("name"), test_fn), +/// kernel::kunit::kunit_case_null(), +/// ]; +/// kernel::kunit_unsafe_test_suite!(suite_name, KUNIT_TEST_CASES); +/// ``` +#[doc(hidden)] +#[macro_export] +macro_rules! kunit_unsafe_test_suite { + ($name:ident, $test_cases:ident) => { + const _: () = { + const KUNIT_TEST_SUITE_NAME: [::kernel::ffi::c_char; 256] = { + let name_u8 = ::core::stringify!($name).as_bytes(); + let mut ret = [0; 256]; + + if name_u8.len() > 255 { + panic!(concat!( + "The test suite name `", + ::core::stringify!($name), + "` exceeds the maximum length of 255 bytes." + )); + } + + let mut i = 0; + while i < name_u8.len() { + ret[i] = name_u8[i] as ::kernel::ffi::c_char; + i += 1; + } + + ret + }; + + static mut KUNIT_TEST_SUITE: ::kernel::bindings::kunit_suite = + ::kernel::bindings::kunit_suite { + name: KUNIT_TEST_SUITE_NAME, + #[allow(unused_unsafe)] + // SAFETY: `$test_cases` is passed in by the user, and + // (as documented) must be valid for the lifetime of + // the suite (i.e., static). + test_cases: unsafe { + ::core::ptr::addr_of_mut!($test_cases) + .cast::<::kernel::bindings::kunit_case>() + }, + suite_init: None, + suite_exit: None, + init: None, + exit: None, + attr: ::kernel::bindings::kunit_attributes { + speed: ::kernel::bindings::kunit_speed_KUNIT_SPEED_NORMAL, + }, + status_comment: [0; 256usize], + debugfs: ::core::ptr::null_mut(), + log: ::core::ptr::null_mut(), + suite_init_err: 0, + is_init: false, + }; + + #[used] + #[allow(unused_unsafe)] + #[cfg_attr(not(target_os = "macos"), link_section = ".kunit_test_suites")] + static mut KUNIT_TEST_SUITE_ENTRY: *const ::kernel::bindings::kunit_suite = + // SAFETY: `KUNIT_TEST_SUITE` is static. + unsafe { ::core::ptr::addr_of_mut!(KUNIT_TEST_SUITE) }; + }; + }; +} + +/// Returns whether we are currently running a KUnit test. +/// +/// In some cases, you need to call test-only code from outside the test case, for example, to +/// create a function mock. This function allows to change behavior depending on whether we are +/// currently running a KUnit test or not. +/// +/// # Examples +/// +/// This example shows how a function can be mocked to return a well-known value while testing: +/// +/// ``` +/// # use kernel::kunit::in_kunit_test; +/// fn fn_mock_example(n: i32) -> i32 { +/// if in_kunit_test() { +/// return 100; +/// } +/// +/// n + 1 +/// } +/// +/// let mock_res = fn_mock_example(5); +/// assert_eq!(mock_res, 100); +/// ``` +pub fn in_kunit_test() -> bool { + // SAFETY: `kunit_get_current_test()` is always safe to call (it has fallbacks for + // when KUnit is not enabled). + !unsafe { bindings::kunit_get_current_test() }.is_null() +} + +#[kunit_tests(rust_kernel_kunit)] +mod tests { + use super::*; + + #[test] + fn rust_test_kunit_example_test() { + #![expect(clippy::eq_op)] + assert_eq!(1 + 1, 2); + } + + #[test] + fn rust_test_kunit_in_kunit_test() { + assert!(in_kunit_test()); + } +} |