【Rust自学】11.8. 忽略测试

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11.8.1. 忽略某些测试，执行剩余测试

某些测试执行起来非常耗时，所以在大部分情况下会想在运行cargo test时忽略它们，除非手动运行这些测试。

对于这些测试，Rust提供了ignore这个attribute(属性)，将这些测试设为默认不执行。

看个例子：

rust 复制代码

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

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

    #[test]
    #[ignore]
    fn expensive_test() {
        assert_eq!(5, 1 + 1 + 1 + 1 + 1)
    }
}

由于expensive_test被加了ignore这个attribute，所以在cargo test不会执行，除非手动指定执行它们。

看一下测试结果：

$ cargo test
   Compiling adder v0.1.0 (file:///projects/adder)
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.60s
     Running unittests src/lib.rs (target/debug/deps/adder-92948b65e88960b4)

running 2 tests
test tests::expensive_test ... ignored
test tests::it_works ... ok

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

   Doc-tests adder

running 0 tests

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

11.8.2. 单独执行被忽略的测试

那么如何单独运行这些被忽略的测试呢？添加参数即可，写：cargo test -- --ignored

$ cargo test -- --ignored
   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 1 test
test expensive_test ... ok

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

   Doc-tests adder

running 0 tests

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

控制程序运行哪些测试可以确保快速返回cargo test结果，如果时间充裕，想要执行所有的测试（包括被忽略的和没被忽略的），就写cargo test -- --include-ignored