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11.7.1. 按名称运行测试的子集

如果想要选择运行的测试，就将测试的名称（一个或多个）作为cargo test的参数。

看个例子：

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);
    }
}

这里有三个测试，假如我们只想要测试one_hundred这个参数，就这么写：cargo test onne_hundred:

$ cargo test one_hundred
   Compiling adder v0.1.0 (file:///projects/adder)
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.69s
     Running unittests src/lib.rs (target/debug/deps/adder-92948b65e88960b4)

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

运行单个测试直接指定测试名就可以。运行多个测试指定测试名的一部分（模块名也可以）作为参数，这样任何匹配这一名称的测试都会被执行。

举个例子，假如我想要执行add_two_and_two()和add_three_and_two，这两个测试的名称都含有add这个部分，就写:cargo test add:

$ cargo test add
   Compiling adder v0.1.0 (file:///projects/adder)
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.61s
     Running unittests src/lib.rs (target/debug/deps/adder-92948b65e88960b4)

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