glob!() that matches no files counts as a success

[tornewuff]

Description

The glob!() macro doesn't raise any kind of objection if the glob matches no files; it just runs the closure zero times. This seems unlikely to be intended in test code.

Reproduction steps

#[test]
fn glob_fails() {
    insta::glob!("nonexistent", |_| { panic!(); });
}

Additional helpful information:

• Version of insta: 1.4.0
• Version of rustc: 1.48.0
• Operating system and version: Debian bullssye

What did you expect

I would expect an assert!() that the glob matched at least one file, to guard against incorrect globs in tests.

[tornewuff]

Thanks!