Cargo test output with indentation

Is there a crate to show the cargo test output like this?

I want to print out ordered by mods and with indentation, removing duplicate prefixes with the function namespace.

For example, this output:

test e2e::web::api::v1::contexts::category::contract::it_should_not_allow_adding_duplicated_categories ... ok
test e2e::web::api::v1::contexts::tag::contract::it_should_not_allow_adding_duplicated_tags ... ok
test e2e::web::api::v1::contexts::category::contract::it_should_not_allow_non_admins_to_delete_categories ... ok
test e2e::web::api::v1::contexts::tag::contract::it_should_not_allow_adding_a_tag_with_an_empty_name ... ok
test e2e::web::api::v1::contexts::tag::contract::it_should_not_allow_guests_to_delete_tags ... ok
test e2e::web::api::v1::contexts::category::contract::it_should_allow_admins_to_delete_categories ... ok
test e2e::web::api::v1::contexts::user::contract::banned_user_list::it_should_allow_an_admin_to_ban_a_user ... ok
test e2e::web::api::v1::contexts::tag::contract::it_should_allow_admins_to_delete_tags ... ok
test e2e::web::api::v1::contexts::user::contract::banned_user_list::it_should_not_allow_a_non_admin_to_ban_a_user ... ok
test e2e::web::api::v1::contexts::tag::contract::it_should_not_allow_non_admins_to_delete_tags ... ok

should produce this output:

               it_should_not_allow_adding_duplicated_categories ... ok
               it_should_not_allow_non_admins_to_delete_categories ... ok
               it_should_allow_admins_to_delete_categories ... ok
                it_should_not_allow_adding_duplicated_tags ... ok
                it_should_not_allow_adding_a_tag_with_an_empty_name ... ok
                it_should_not_allow_guests_to_delete_tags ... ok
                it_should_allow_admins_to_delete_tags ... ok
                it_should_not_allow_non_admins_to_delete_tags ... ok
                  it_should_allow_an_admin_to_ban_a_user ... ok
                  it_should_not_allow_a_non_admin_to_ban_a_user ... ok
1 Like

It's not hard:

Also you can use the following code (100~ lines in total) with to achieve your goal.

  • cargo install rust-script
  • execute the code
    • save the code in a file named pretty-test
    • chmod +x ./pretty-test
    • add it in your environment, like mv pretty-test ~/.cargo/bin
    • run pretty-test in your project
// src/
#[test] fn works() {}
mod a {
    mod b {
        #[test] fn c() { panic!() }
    #[test] fn d() {}

// output:
├── a
│   ├── b
│   │   └─ ❌ c
│   └─ ✅ d
└─ ✅ works
#!/usr/bin/env rust-script
//! ```cargo
//! [dependencies]
//! termtree = "0.4.1"
//! regex-lite = "0.1"
//! ```

use regex_lite::Regex;
use std::{
    collections::{btree_map::Entry, BTreeMap},
use termtree::{GlyphPalette, Tree};

fn main() {
    let output = Command::new("cargo").arg("test").output().unwrap();
    let text = String::from_utf8_lossy(&output.stdout);

    let re = Regex::new(r"(?m)^test \S+ \.\.\. \S+$").unwrap();
        pretty_test(re.find_iter(&text).map(|m| m.as_str())).unwrap()

enum Node<'s> {
    Path(BTreeMap<&'s str, Node<'s>>),
    Status(&'s str),

fn pretty_test<'s>(lines: impl Iterator<Item = &'s str>) -> Option<String> {
    let mut path = BTreeMap::new();
    for line in lines {
        let mut iter = line.splitn(3, ' ');
        let mut split = iter.nth(1)?.split("::");
        let next =;
        let status =;
        make_mods(split, status, &mut path, next);
    let mut tree = Tree::new("test");
    for (root, child) in path {
        make_tree(root, &child, &mut tree);

// Add paths to Node
fn make_mods<'s>(
    mut split: impl Iterator<Item = &'s str>,
    status: &'s str,
    path: &mut BTreeMap<&'s str, Node<'s>>,
    key: Option<&'s str>,
) {
    let Some(key) = key else { return };
    let next =;
    match path.entry(key) {
        Entry::Vacant(empty) => {
            if next.is_some() {
                let mut btree = BTreeMap::new();
                make_mods(split, status, &mut btree, next);
            } else {
        Entry::Occupied(mut btree) => {
            if let Node::Path(btree) = btree.get_mut() {
                make_mods(split, status, btree, next)

// Add Node to Tree
fn make_tree<'s>(root: &'s str, node: &Node<'s>, parent: &mut Tree<&'s str>) {
    match node {
        Node::Path(btree) => {
            let mut t = Tree::new(root);
            for (path, child) in btree {
                make_tree(path, child, &mut t);
        Node::Status(s) => {

// Display with a status icon
fn set_status(status: &str) -> GlyphPalette {
    let mut glyph = GlyphPalette::new();
    glyph.item_indent = if status.ends_with("ok") {
        "─ ✅ "
    } else {
        "─ ❌ "

Awesome @vague you made my day! It's something I'd missed a lot. I knew I would need some kind of tree structure and that's why I was looking for a crate.

Hi @vague, I've created a repo:

We can move it to your account on GitHub, or I can make you an owner if you agree (and with whatever the LICENSE you want to use). I've made some changes, like getting the input from the standard input, but I do not like it because if there is no input, it waits until the user cancels it with Ctrl+D or Ctrl+Z.

1 Like

But it requires the user to copy & paste part of the output from cargo test to your cli, which is inconvenient. That's why I obtain and handle the cargo test output in the script.

In README, the usage with rust-script is wrong because there is no dependencies declaration in the script (or root file). You have already put it in the project, so it'd be better deleting the rust-script usage.

1 Like

FYI with RFC 3455 merged, there is now a t-testing-devex team that will be looking at improving things. We're a bit slow getting started up as we are trying to roll off of other projects. One big focus I expect from this effort is to at least make programmtic output more meaningful so its easier to generate these custom UIs even if we don't bake a UI like this into it.


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