随便写一个测试 mod，包含多个单元测试：
mod tests {
use std::time::Duration;
fn print_my_pid_and_tid() {
let pid = std::process::id();
let tid = nix::unistd::gettid();
println!("my pid is {}, tid is {}", pid, tid);
}
fn hard_job() {
std:🧵:sleep(Duration::from_secs(2));
}
macro_rules! generate_test_functions {
($name:ident) => {
#[test]
fn $name() {
hard_job();
print_my_pid_and_tid();
}
};
}
generate_test_functions!(test_0);
generate_test_functions!(test_1);
generate_test_functions!(test_2);
generate_test_functions!(test_3);
generate_test_functions!(test_4);
generate_test_functions!(test_5);
generate_test_functions!(test_6);
generate_test_functions!(test_7);
generate_test_functions!(test_8);
generate_test_functions!(test_9);
generate_test_functions!(test_10);
generate_test_functions!(test_11);
generate_test_functions!(test_12);
generate_test_functions!(test_13);
generate_test_functions!(test_14);
generate_test_functions!(test_15);
generate_test_functions!(test_16);
generate_test_functions!(test_17);
generate_test_functions!(test_18);
generate_test_functions!(test_19);
}
运行整个测试 mod：
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cargo test -- --nocapture
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执行结果：
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$ cargo test -- --nocapture
Finished test [unoptimized + debuginfo] target(s) in 0.03s
Running unittests src/lib.rs (target/debug/deps/test_isolation-64b5602935747ce0)
running 20 tests
my pid is 429416, tid is 429417
my pid is 429416, tid is 429418
test tests::test_0 ... ok
my pid is 429416, tid is 429419
test tests::test_1 ... ok
test tests::test_10 ... ok
my pid is 429416, tid is 429420
test tests::test_11 ... ok
my pid is 429416, tid is 429421
test tests::test_12 ... ok
my pid is 429416, tid is 429422
my pid is 429416, tid is 429424
test tests::test_13 ... ok
test tests::test_15 ... ok
my pid is 429416, tid is 429425
my pid is 429416, tid is 429423
test tests::test_16 ... ok
my pid is 429416, tid is 429426
my pid is 429416, tid is 429427
test tests::test_14 ... ok
test tests::test_17 ... ok
test tests::test_18 ... ok
my pid is 429416, tid is 429428
test tests::test_19 ... ok
my pid is 429416, tid is 429483
my pid is 429416, tid is 429484
test tests::test_2 ... ok
test tests::test_3 ... my pid is 429416, tid is 429485
ok
test tests::test_4 ... ok
my pid is 429416, tid is 429486
my pid is 429416, tid is 429487
test tests::test_5 ... ok
test tests::test_6 ... ok
my pid is 429416, tid is 429488
my pid is 429416, tid is 429489
test tests::test_7 ... ok
test tests::test_8 ... ok
my pid is 429416, tid is 429490
test tests::test_9 ... ok
test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 4.00s
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可见，这 20 个单元测试，都在在同一个进程中运行的，但是没有在同一个线程中运行。
看看 cargo 提供的 –test-threads 参数：
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--test-threads n_threads
Number of threads used for running tests in parallel
By default, all tests are run in parallel. This can be altered with the
--test-threads flag or the RUST_TEST_THREADS environment variable when running
tests (set it to 1).
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试试将 –test-threads 指定为 1， 会发生什么？
cargo test -- --nocapture --test-threads 1
执行结果：
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$ cargo test -- --nocapture --test-threads 1
Finished test [unoptimized + debuginfo] target(s) in 0.03s
Running unittests src/lib.rs (target/debug/deps/test_isolation-64b5602935747ce0)
running 20 tests
test tests::test_0 ... my pid is 435905, tid is 435905
ok
test tests::test_1 ... my pid is 435905, tid is 435905
ok
test tests::test_10 ... my pid is 435905, tid is 435905
ok
test tests::test_11 ... my pid is 435905, tid is 435905
ok
test tests::test_12 ... my pid is 435905, tid is 435905
ok
test tests::test_13 ... my pid is 435905, tid is 435905
ok
test tests::test_14 ... my pid is 435905, tid is 435905
ok
test tests::test_15 ... my pid is 435905, tid is 435905
ok
test tests::test_16 ... my pid is 435905, tid is 435905
ok
test tests::test_17 ... my pid is 435905, tid is 435905
ok
test tests::test_18 ... my pid is 435905, tid is 435905
ok
test tests::test_19 ... my pid is 435905, tid is 435905
ok
test tests::test_2 ... my pid is 435905, tid is 435905
ok
test tests::test_3 ... my pid is 435905, tid is 435905
ok
test tests::test_4 ... my pid is 435905, tid is 435905
ok
test tests::test_5 ... my pid is 435905, tid is 435905
ok
test tests::test_6 ... my pid is 435905, tid is 435905
ok
test tests::test_7 ... my pid is 435905, tid is 435905
ok
test tests::test_8 ... my pid is 435905, tid is 435905
ok
test tests::test_9 ... my pid is 435905, tid is 435905
ok
test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 40.00s
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这么多单元测试，不仅全都在同一个进程中运行的，而且还在同一个线程中运行的。
使用 nextest-rs/nextest，让每个单元测试都在不同的进程中运行
cargo nextest run --hide-progress-bar --success-output immediate
执行结果：
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$ cargo nextest run --hide-progress-bar --success-output immediate
Finished test [unoptimized + debuginfo] target(s) in 0.04s
Executable unittests src/lib.rs (target/debug/deps/test_isolation-64b5602935747ce0)
Starting 20 tests across 1 binaries
PASS [ 2.005s] test_isolation tests::test_0
--- STDOUT: test_isolation tests::test_0 ---
running 1 test
my pid is 443021, tid is 443027
test tests::test_0 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.006s] test_isolation tests::test_1
--- STDOUT: test_isolation tests::test_1 ---
running 1 test
my pid is 443022, tid is 443029
test tests::test_1 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.009s] test_isolation tests::test_10
--- STDOUT: test_isolation tests::test_10 ---
running 1 test
my pid is 443023, tid is 443032
test tests::test_10 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.007s] test_isolation tests::test_12
--- STDOUT: test_isolation tests::test_12 ---
running 1 test
my pid is 443025, tid is 443034
test tests::test_12 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.008s] test_isolation tests::test_11
--- STDOUT: test_isolation tests::test_11 ---
running 1 test
my pid is 443024, tid is 443035
test tests::test_11 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.010s] test_isolation tests::test_13
--- STDOUT: test_isolation tests::test_13 ---
running 1 test
my pid is 443026, tid is 443036
test tests::test_13 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.009s] test_isolation tests::test_14
--- STDOUT: test_isolation tests::test_14 ---
running 1 test
my pid is 443028, tid is 443039
test tests::test_14 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.008s] test_isolation tests::test_15
--- STDOUT: test_isolation tests::test_15 ---
running 1 test
my pid is 443030, tid is 443040
test tests::test_15 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.009s] test_isolation tests::test_17
--- STDOUT: test_isolation tests::test_17 ---
running 1 test
my pid is 443033, tid is 443041
test tests::test_17 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.011s] test_isolation tests::test_16
--- STDOUT: test_isolation tests::test_16 ---
running 1 test
my pid is 443031, tid is 443042
test tests::test_16 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.008s] test_isolation tests::test_18
--- STDOUT: test_isolation tests::test_18 ---
running 1 test
my pid is 443037, tid is 443043
test tests::test_18 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.007s] test_isolation tests::test_19
--- STDOUT: test_isolation tests::test_19 ---
running 1 test
my pid is 443038, tid is 443044
test tests::test_19 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.006s] test_isolation tests::test_3
--- STDOUT: test_isolation tests::test_3 ---
running 1 test
my pid is 443102, tid is 443106
test tests::test_3 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.008s] test_isolation tests::test_2
--- STDOUT: test_isolation tests::test_2 ---
running 1 test
my pid is 443101, tid is 443107
test tests::test_2 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.007s] test_isolation tests::test_4
--- STDOUT: test_isolation tests::test_4 ---
running 1 test
my pid is 443104, tid is 443111
test tests::test_4 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.007s] test_isolation tests::test_6
--- STDOUT: test_isolation tests::test_6 ---
running 1 test
my pid is 443108, tid is 443113
test tests::test_6 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.010s] test_isolation tests::test_5
--- STDOUT: test_isolation tests::test_5 ---
running 1 test
my pid is 443105, tid is 443114
test tests::test_5 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.006s] test_isolation tests::test_8
--- STDOUT: test_isolation tests::test_8 ---
running 1 test
my pid is 443110, tid is 443115
test tests::test_8 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.008s] test_isolation tests::test_7
--- STDOUT: test_isolation tests::test_7 ---
running 1 test
my pid is 443109, tid is 443116
test tests::test_7 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
PASS [ 2.007s] test_isolation tests::test_9
--- STDOUT: test_isolation tests::test_9 ---
running 1 test
my pid is 443112, tid is 443117
test tests::test_9 ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 19 filtered out; finished in 2.00s
------------
Summary [ 4.023s] 20 tests run: 20 passed, 0 skipped
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可以看到，nextest-rs/nextest 会让每个单元测试在独立的进程中运行。
