Renumber Rust tests or benchmarks

Overview

renumber is a simple command-line utility that renumbers Rust tests and benchmarks.

It is particularly useful when a single test or benchmark file contains multiple functions that don't require meaningful names, such as in test-driven development (TDD). renumber renames these functions sequentially as _0001, _0002, _0003, and so on.

Example

Input file

$ cat ./tests/test_doc.rs

Output:

#[test]
fn _one_should_be_equal_to_one() {
  assert_eq!(1, 1);
}

#[test]
fn _one_should_not_be_equal_to_two() {
  assert_ne!(1, 2);
}

#[test]
fn _first_name_should_be_shorter_than_the_second() {
  let first_name = "John";
  let second_name = "Alexander";
  assert!(first_name.cmp(&second_name).is_gt());
}

NOTE: Test names begin with underscore, otherwise renumber will skip it.

Renumbering

$ renumber ./tests/test_doc.rs

Input file after renumbering

#[test]
fn _0001() {
  assert_eq!(1, 1);
}

#[test]
fn _0002() {
  assert_ne!(1, 2);
}

#[test]
fn _0003() {
  let first_name = "John";
  let second_name = "Alexander";
  assert!(first_name.cmp(&second_name).is_gt());
}

Hints & Tips

• renumber takes a single command-line argument, the input file to be renumbered.
• If renumbering is successful, the input file is OVERWRITTEN with the new, renumbered content.
• Only functions annotated with #[test] or #[bench] and whose names begin with an underscore (_) are renamed.
• Numbering starts from 1.
• The new name follows this pattern: format!("_{:04}", index).

License

Licensed under either of

• MIT license (LICENSE-MIT), or
• Apache License, Version 2.0 (LICENSE) at your option.

Contribution

Any contributions to renumber are greatly appreciated. All contributions intentionally submitted for inclusion in the work by you, shall be dual licensed as above, without any additional terms or conditions.