11.7 按测试的名称运行测试

11.7.1. 按名称运行测试的子集

如果想选择运行哪些测试，就把测试名称（一个或多个）作为参数传给cargo test。

看个例子：

#![allow(unused)]
fn main() {
pub fn add_two(a: usize) -> usize {
    a + 2
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn add_two_and_two() {
        let result = add_two(2);
        assert_eq!(result, 4);
    }

    #[test]
    fn add_three_and_two() {
        let result = add_two(3);
        assert_eq!(result, 5);
    }

    #[test]
    fn one_hundred() {
        let result = add_two(100);
        assert_eq!(result, 102);
    }
}
}

如果只想运行one_hundred这个测试，就写cargo test one_hundred：

$ cargo test one_hundred
   Compiling adder v0.1.0 (file:///projects/adder)
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.12s
     Running unittests src/lib.rs (target/debug/deps/adder-302521ba8d0f0bdf)

running 1 test
test tests::one_hundred ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 2 filtered out; finished in 0.00s

运行单个测试时，直接指定它的精确名称即可。运行多个测试时，指定测试名的一部分（模块名也可以）作为参数，所有匹配该名称的测试都会运行。

举个例子，假如我想运行add_two_and_two()和add_three_and_two，这两个测试的名称都含有add，就可以写cargo test add：

$ cargo test add
   Compiling adder v0.1.0 (file:///projects/adder)
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.11s
     Running unittests src/lib.rs (target/debug/deps/adder-302521ba8d0f0bdf)

running 2 tests
test tests::add_three_and_two ... ok
test tests::add_two_and_two ... ok

test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 1 filtered out; finished in 0.00s