From bacd57a583338b5667046abe474e728a5e881cd0 Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume1.gomez@gmail.com>
Date: Sun, 16 Mar 2025 14:45:08 +0100
Subject: [PATCH 1/2] Add integer to string formatting tests

---
 library/alloctests/tests/lib.rs |  1 +
 library/alloctests/tests/num.rs | 69 +++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 library/alloctests/tests/num.rs

diff --git a/library/alloctests/tests/lib.rs b/library/alloctests/tests/lib.rs
index 46c11ea150bf8..f1f4cc6f93bbd 100644
--- a/library/alloctests/tests/lib.rs
+++ b/library/alloctests/tests/lib.rs
@@ -63,6 +63,7 @@ mod fmt;
 mod heap;
 mod linked_list;
 mod misc_tests;
+mod num;
 mod rc;
 mod slice;
 mod sort;
diff --git a/library/alloctests/tests/num.rs b/library/alloctests/tests/num.rs
new file mode 100644
index 0000000000000..c9c0cd09ff6ab
--- /dev/null
+++ b/library/alloctests/tests/num.rs
@@ -0,0 +1,69 @@
+use std::fmt::{Debug, Display};
+use std::str::FromStr;
+
+fn assert_nb<Int: ToString + FromStr + Debug + Display + Eq>(value: Int) {
+    let s = value.to_string();
+    let s2 = format!("{}", value);
+
+    assert_eq!(s, s2);
+    let Ok(ret) = Int::from_str(&s) else {
+        panic!("failed to convert into to string");
+    };
+    assert_eq!(ret, value);
+}
+
+macro_rules! uint_to_s {
+    ($($fn_name:ident, $int:ident,)+) => {
+        $(
+            #[test]
+            fn $fn_name() {
+                assert_nb::<$int>($int::MIN);
+                assert_nb::<$int>($int::MAX);
+                assert_nb::<$int>(1);
+                assert_nb::<$int>($int::MIN / 2);
+                assert_nb::<$int>($int::MAX / 2);
+            }
+        )+
+    }
+}
+macro_rules! int_to_s {
+    ($($fn_name:ident, $int:ident,)+) => {
+        $(
+            #[test]
+            fn $fn_name() {
+                assert_nb::<$int>($int::MIN);
+                assert_nb::<$int>($int::MAX);
+                assert_nb::<$int>(1);
+                assert_nb::<$int>(0);
+                assert_nb::<$int>(-1);
+                assert_nb::<$int>($int::MIN / 2);
+                assert_nb::<$int>($int::MAX / 2);
+            }
+        )+
+    }
+}
+
+int_to_s!(
+    test_i8_to_string,
+    i8,
+    test_i16_to_string,
+    i16,
+    test_i32_to_string,
+    i32,
+    test_i64_to_string,
+    i64,
+    test_i128_to_string,
+    i128,
+);
+uint_to_s!(
+    test_u8_to_string,
+    u8,
+    test_u16_to_string,
+    u16,
+    test_u32_to_string,
+    u32,
+    test_u64_to_string,
+    u64,
+    test_u128_to_string,
+    u128,
+);

From 25900c2768b0b3e3d55a531c9aeb27edaccb92d1 Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume1.gomez@gmail.com>
Date: Sun, 23 Mar 2025 22:21:41 +0100
Subject: [PATCH 2/2] Tweak integer to string conversion test a bit to be
 future-proof

---
 library/alloctests/tests/num.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/library/alloctests/tests/num.rs b/library/alloctests/tests/num.rs
index c9c0cd09ff6ab..3c76e68c60640 100644
--- a/library/alloctests/tests/num.rs
+++ b/library/alloctests/tests/num.rs
@@ -3,9 +3,9 @@ use std::str::FromStr;
 
 fn assert_nb<Int: ToString + FromStr + Debug + Display + Eq>(value: Int) {
     let s = value.to_string();
-    let s2 = format!("{}", value);
+    let s2 = format!("s: {}.", value);
 
-    assert_eq!(s, s2);
+    assert_eq!(format!("s: {s}."), s2);
     let Ok(ret) = Int::from_str(&s) else {
         panic!("failed to convert into to string");
     };