So far, we only have file system fixture initialization and not file system assertions ### Prior Art - assert_cli and https://github.com/assert-rs/assert_cli/pull/98/commits - [cli_test_dir](https://docs.rs/cli_test_dir/0.1.5/cli_test_dir/) - [predicates::fs](https://github.com/assert-rs/predicates-rs/tree/master/src/path) - [dir-diff](https://github.com/steveklabnik/dir-diff) + [assert_dirs_eq](https://github.com/cobalt-org/cobalt.rs/blob/master/tests/mod.rs#L27) = https://github.com/steveklabnik/dir-diff/pull/17
