rust - 如何使用具有 doctests 的 Rust 项目实现条件编译？

Question

我已经使用条件编译来更改函数的类型签名，现在无法为两种“功能”模式运行相同的 doctest，因此我需要一种选择退出 doctest 的方法。

我尝试合并在正常测试中使用的#[cfg_attr(feature = "rss_loose", ignore)] 和///rust,ignore 来制作///rust,cfg_attr(feature = "rss_loose", ignore) 但这似乎不起作用。

Answer 1

只需编写两套不同的文档和测试，一切都将按原样运行:

/// ```
/// assert_eq!(42, dt::foo());
/// ```
#[cfg(not(feature = "alternate"))]
pub fn foo() -> u8 { 42 }

/// ```
/// assert_eq!(true, dt::foo());
/// ```
#[cfg(feature = "alternate")]
pub fn foo() -> bool { true }

$ cargo test
   Compiling dt v0.1.0 (file:///private/tmp/dt)
     Running target/debug/dt-c3e297f8592542b5

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured

   Doc-tests dt

running 1 test
test foo_0 ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured

$ cargo test --features=alternate
   Compiling dt v0.1.0 (file:///private/tmp/dt)
     Running target/debug/dt-c3e297f8592542b5

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured

   Doc-tests dt

running 1 test
test foo_0 ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured