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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">#[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 testCompiling adder v0.1.0 (file:///projects/adder)Finished `test` profile [unoptimized + debuginfo] target(s) in 0.60sRunning unittests src/lib.rs (target/debug/deps/adder-92948b65e88960b4)running 2 tests
test tests::expensive_test ... ignored
test tests::it_works ... oktest result: ok. 1 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.00sDoc-tests adderrunning 0 teststest 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 -- --ignoredCompiling adder v0.1.0 (file:///projects/adder)Finished `test` profile [unoptimized + debuginfo] target(s) in 0.61sRunning unittests src/lib.rs (target/debug/deps/adder-92948b65e88960b4)running 1 test
test expensive_test ... oktest result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 1 filtered out; finished in 0.00sDoc-tests adderrunning 0 teststest 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
