单元测试与集成测试

       Running unittests src/lib.rs (<实验目录>/target/debug/deps/calc-ae581424acae7e17)
       Running tests/api.rs (<实验目录>/target/debug/deps/api-db5bac28d6805c15)
       Running tests/second.rs (<实验目录>/target/debug/deps/second-191b2db47871f4f4)
     Doc-tests calc
  running 5 tests
  test tests::add_works ... ok
  test tests::can_test_private ... ok
  test tests::slow_test ... ignored, 很慢
  test tests::prints_something ... ok
  test tests::div_by_zero - should panic ... ok
  test result: ok. 4 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.00s
  running 1 test
  test public_api ... ok
  test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 1 filtered out; finished in 0.00s
  running 1 test
  test div_ok ... ok
  test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
  running 0 tests
  test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

  error[E0603]: function `secret` is private
    |           ^^^^^^ private function
  For more information about this error, try `rustc --explain E0603`.

  --list 列出的单元测试: ['tests::add_works: test', 'tests::can_test_private: test', 'tests::div_by_zero: test', 'tests::prints_something: test', 'tests::slow_test: test']
  按名字过滤 add:
    test tests::add_works ... ok
    test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 4 filtered out; finished in 0.00s
  --ignored 只跑被忽略的:
    test tests::slow_test ... ok
    test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 4 filtered out; finished in 0.30s
  默认(被忽略的显示为 ignored):
    test tests::add_works ... ok
    test tests::slow_test ... ignored, 很慢
    test tests::can_test_private ... ok
    test tests::prints_something ... ok
    test tests::div_by_zero - should panic ... ok
    test result: ok. 4 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.00s

  cargo test --test api 退出码 101
       Running tests/api.rs (<实验目录>/target/debug/deps/api-db5bac28d6805c15)
  error: test failed, to rerun pass `--test api`
  running 2 tests
  test public_api ... ok
  test failing_example ... FAILED
  failures:
  ---- failing_example stdout ----
  thread 'failing_example' (7546628) panicked at tests/api.rs:3:32:
  assertion `left == right` failed: 故意失败的断言
    left: 2
   right: 3
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
  failures:
      failing_example
  test result: FAILED. 1 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
  --nocapture 时: ['这行 stdout 默认被捕获,只有失败或 --nocapture 才显示']
  不加 --nocapture(通过的测试): []

  默认并行               ['同时运行的 work() 最多 4 个']  测试汇总行里的 finished in 0.41 s
  --test-threads=1   ['test zz_report ... 同时运行的 work() 最多 1 个']  测试汇总行里的 finished in 0.83 s