在 运行 `cargo test` 时记录

Question

#[macro_use]
extern crate log;

fn whatever() {
    info!("whatever")
}

#[test]
fn test() {
    whatever();
}

我想在 运行 单元测试 (cargo test) 后查看日志， 怎么可能现在?

Answer 1

log crate 本身不做任何日志记录。来自 the main documentation page:

If no logging implementation is selected, the facade falls back to a "noop" implementation that ignores all log messages.

为了让您的日志消息能够随处可见，您必须初始化特定的日志记录实现，例如 env_logger. However, it seems that right now, there is no way to perform initialization before tests are run。