[英]Where should I put test utility functions in Rust?
I have the following code defining a path where generated files can be placed: 我有以下代码定义生成文件的路径:
fn gen_test_dir() -> tempdir::TempDir {
tempdir::TempDir::new_in(Path::new("/tmp"), "filesyncer-tests").unwrap()
}
This function is defined in tests/lib.rs
, used in the tests in that file and I would also like to use it in the unit tests located in src/lib.rs
. 这个函数在
tests/lib.rs
定义,在该文件的测试中使用,我也想在src/lib.rs
中的单元测试中使用它。
Is this possible to achieve without compiling the utility functions into the non-test binary and without duplicating code? 如果不将实用程序功能编译成非测试二进制文件而不重复代码,是否可以实现?
What I do is put my unit tests with any other utilities into a submodule protected with #[cfg(test)]
: 我所做的是将我的单元测试与任何其他工具一起放入一个受
#[cfg(test)]
保护的子模块中:
#[cfg(test)]
mod tests { // The contents could be a separate file if it helps organisation
// Not a test, but available to tests.
fn some_utility(s: String) -> u32 {
...
}
#[test]
fn test_foo() {
assert_eq!(...);
}
// more tests
}
You can import from your #[cfg(test)]
modules from other #[cfg(test)]
modules, so, for example, in main.rs
or in some other module, you can do something like: 您可以从导入
#[cfg(test)]
从其它模块#[cfg(test)]
模块,因此,例如,在main.rs
或以其他模块,你可以这样做:
#[cfg(test)]
pub mod test_util {
pub fn return_two() -> usize { 2 }
}
and then from anywhere else in your project: 然后从项目的其他任何地方:
#[cfg(test)]
mod test {
use crate::test_util::return_two;
#[test]
fn test_return_two() {
assert_eq!(return_two(), 2);
}
}
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