No, you couldn't. If running the code is too dangerous, then so is running the unit test suite. You'd have to prove that it doesn't do anything observable, like

No, you couldn't. If running the code is too dangerous, then so is running the unit test suite. You'd have to prove that it doesn't do anything observable, like accidentally deleting your home directory, or, if the code is actively malicious, uploading your SSH key somewhere. And if you can do that, you probably also have enough information to provide good completion without running the code.