我想了解 #[cfg(test)]
和 #[cfg(feature = "test")]
之间的区别,最好通过示例进行演示。
最佳答案
#[cfg(test)]
标记仅当启用 test
配置选项时才编译的内容,而 #[cfg(feature = "test ")]
标记仅当启用 feature = "test"
配置选项时才编译的内容。
When running cargo test
, one of the things that happens is that rustc
is passed the --test
flag which (among other things) "enables the test cfg option".这通常用于仅在您想要运行测试时有条件地编译测试模块。
尝试运行:
#[cfg(feature="test")]
mod fake_test {
#[test]
fn fake_test() {
panic!("This function is NOT tested");
}
}
#[cfg(test)]
mod test {
#[test]
fn test() {
panic!("This function is tested");
}
}
输出将是:
running 1 test
test test::test ... FAILED
failures:
---- test::test stdout ----
thread 'test::test' panicked at 'This function is tested', src/lib.rs:13:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
failures:
test::test
test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
这表明假测试模块没有启用。
关于rust - `#[cfg(test)]` 和 `#[cfg(feature = "test")]` 有什么区别?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/72908829/