From 3ff3b66b3ea8e6b58c635fbb3cdf513fb65014f7 Mon Sep 17 00:00:00 2001
From: Alex Saveau <saveau.alexandre+tmp@gmail.com>
Date: Wed, 13 Nov 2024 20:12:37 -0500
Subject: [PATCH] Add tests so people messing with DecInt can catch UB with
 miri

---
 tests/path/dec_int.rs | 50 ++++++++++++++++++++++++++++++-------------
 1 file changed, 35 insertions(+), 15 deletions(-)

diff --git a/tests/path/dec_int.rs b/tests/path/dec_int.rs
index 6ce1a5123..71660a073 100644
--- a/tests/path/dec_int.rs
+++ b/tests/path/dec_int.rs
@@ -1,20 +1,40 @@
 use rustix::path::DecInt;
 
+macro_rules! check {
+    ($i:expr) => {
+        let i = $i;
+        assert_eq!(DecInt::new(i).as_ref().to_str().unwrap(), i.to_string());
+    };
+}
+
 #[test]
 fn test_dec_int() {
-    assert_eq!(DecInt::new(0).as_ref().to_str().unwrap(), "0");
-    assert_eq!(DecInt::new(-1).as_ref().to_str().unwrap(), "-1");
-    assert_eq!(DecInt::new(789).as_ref().to_str().unwrap(), "789");
-    assert_eq!(
-        DecInt::new(i64::MIN).as_ref().to_str().unwrap(),
-        i64::MIN.to_string()
-    );
-    assert_eq!(
-        DecInt::new(i64::MAX).as_ref().to_str().unwrap(),
-        i64::MAX.to_string()
-    );
-    assert_eq!(
-        DecInt::new(u64::MAX).as_ref().to_str().unwrap(),
-        u64::MAX.to_string()
-    );
+    check!(0);
+    check!(-1);
+    check!(789);
+
+    check!(u8::MAX);
+    check!(i8::MIN);
+    check!(u16::MAX);
+    check!(i16::MIN);
+    check!(u32::MAX);
+    check!(i32::MIN);
+    check!(u64::MAX);
+    check!(i64::MIN);
+    #[cfg(any(
+        target_pointer_width = "16",
+        target_pointer_width = "32",
+        target_pointer_width = "64"
+    ))]
+    {
+        check!(usize::MAX);
+        check!(isize::MIN);
+    }
+}
+
+#[test]
+#[should_panic]
+fn test_unsupported_dec_int() {
+    check!(u128::MAX);
+    check!(i128::MIN);
 }