From d1835b418f1bc261d6f81f6f31ffa3f137b4908c Mon Sep 17 00:00:00 2001
From: Leedehai <18319900+Leedehai@users.noreply.github.com>
Date: Wed, 6 Dec 2023 05:02:08 -0500
Subject: [PATCH] Use a rotating test progress printer (#2872)

---
 tests/src/tests.rs | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tests/src/tests.rs b/tests/src/tests.rs
index 82876e6cc..d7722ce66 100644
--- a/tests/src/tests.rs
+++ b/tests/src/tests.rs
@@ -4,7 +4,7 @@ use std::cell::{RefCell, RefMut};
 use std::collections::{HashMap, HashSet};
 use std::ffi::OsStr;
 use std::fmt::{self, Display, Formatter, Write as _};
-use std::io::{self, Write};
+use std::io::{self, IsTerminal, Write};
 use std::ops::Range;
 use std::path::{Path, PathBuf};
 use std::{env, fs};
@@ -135,8 +135,10 @@ fn main() {
 
     let len = results.len();
     let ok = results.iter().sum::<usize>();
-    if len > 1 {
-        println!("{ok} / {len} tests passed.");
+    if len > 0 {
+        println!("{ok} / {len} test{} passed.", if len > 1 { "s" } else { "" });
+    } else {
+        println!("No test ran.");
     }
 
     if ok != len {
@@ -475,6 +477,10 @@ fn test(
         stdout.write_all(name.to_string_lossy().as_bytes()).unwrap();
         if ok {
             writeln!(stdout, " ✔").unwrap();
+            if stdout.is_terminal() {
+                // ANSI escape codes: cursor moves up and clears the line.
+                write!(stdout, "\x1b[1A\x1b[2K").unwrap();
+            }
         } else {
             writeln!(stdout, " ❌").unwrap();
         }