Add example for CLI tests with temporary directories and setting the current working directory (CWD) - #284

Add example for CLI tests with temporary directories and setting the current working directory (CWD)#284

Greenheart wants to merge 2 commits into

rust-cli:masterrust-cli/book:masterfrom

Greenheart:feature/add-cli-testing-with-tmp-directory-and-cwdGreenheart/rust_cli_book:feature/add-cli-testing-with-tmp-directory-and-cwdCopy head branch name to clipboard