From 46c70e8a27f7825c73b561fbd09c60b0c050ea5e Mon Sep 17 00:00:00 2001
From: prakrititz <Prakrititzb@gmail.com>
Date: Mon, 31 Aug 2026 09:11:17 +0530
Subject: [PATCH 1/2] test: add deterministic expected panic substrings to
 #[should_panic] tests

---
 tests/bytes.rs |  6 +++---
 tests/main.rs  | 12 ++++++------
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/tests/bytes.rs b/tests/bytes.rs
index 71dbdd5..2698e59 100644
--- a/tests/bytes.rs
+++ b/tests/bytes.rs
@@ -60,7 +60,7 @@ fn test_put_int() {
 }
 
 #[test]
-#[should_panic]
+#[should_panic(expected = "cannot write")]
 fn test_put_int_nbytes_overflow() {
     let mut buf = SmallVec::with_capacity(8);
     buf.put_int(0x1020304050607080, 9);
@@ -74,14 +74,14 @@ fn test_put_int_le() {
 }
 
 #[test]
-#[should_panic]
+#[should_panic(expected = "cannot write")]
 fn test_put_int_le_nbytes_overflow() {
     let mut buf = SmallVec::with_capacity(8);
     buf.put_int_le(0x1020304050607080, 9);
 }
 
 #[test]
-#[should_panic(expected = "advance out of bounds: the len is 8 but advancing by 12")]
+#[should_panic(expected = "advance out of bounds")]
 fn test_smallvec_advance_mut() {
     let mut buf = SmallVec::with_capacity(8);
     unsafe {
diff --git a/tests/main.rs b/tests/main.rs
index a1a0508..2ddd837 100644
--- a/tests/main.rs
+++ b/tests/main.rs
@@ -386,7 +386,7 @@ fn test_append() {
 }
 
 #[test]
-#[should_panic]
+#[should_panic(expected = "new_capacity >= len")]
 fn test_invalid_grow() {
     let mut v: SmallVec<u8, 8> = SmallVec::new();
     v.extend(0..8);
@@ -394,7 +394,7 @@ fn test_invalid_grow() {
 }
 
 #[test]
-#[should_panic]
+#[should_panic(expected = "attempted to index slice up to maximum usize")]
 fn drain_overflow() {
     let mut v: SmallVec<u8, 8> = smallvec![0];
     v.drain(..=usize::MAX);
@@ -425,7 +425,7 @@ fn test_extend_from_within() {
 }
 
 #[test]
-#[should_panic]
+#[should_panic(expected = "drop")]
 fn test_drop_panic_smallvec() {
     // This test should only panic once, and not double panic,
     // which would mean a double drop
@@ -963,21 +963,21 @@ fn max_dont_panic() {
 }
 
 #[test]
-#[should_panic]
+#[should_panic(expected = "removal index")]
 fn max_remove() {
     let mut sv: SmallVec<i32, 2> = smallvec![0];
     sv.remove(usize::MAX);
 }
 
 #[test]
-#[should_panic]
+#[should_panic(expected = "swap_remove index")]
 fn max_swap_remove() {
     let mut sv: SmallVec<i32, 2> = smallvec![0];
     sv.swap_remove(usize::MAX);
 }
 
 #[test]
-#[should_panic]
+#[should_panic(expected = "insertion index")]
 fn max_insert() {
     let mut sv: SmallVec<i32, 2> = smallvec![0];
     sv.insert(usize::MAX, 0);

From 6d8b6193fb9939c94345a43ddf5860030992f300 Mon Sep 17 00:00:00 2001
From: prakrititz <Prakrititzb@gmail.com>
Date: Mon, 31 Aug 2026 19:55:40 +0530
Subject: [PATCH 2/2] feat: updated #[should_panic] attributes for failed
 testcases

#502
updated the panic attributes for the following failures:
    test_put_int_le_nbytes_overflow
    test_put_int_nbytes_overflow
---
 tests/bytes.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/bytes.rs b/tests/bytes.rs
index 2698e59..2f6d334 100644
--- a/tests/bytes.rs
+++ b/tests/bytes.rs
@@ -60,7 +60,7 @@ fn test_put_int() {
 }
 
 #[test]
-#[should_panic(expected = "cannot write")]
+#[should_panic(expected = "size too large")]
 fn test_put_int_nbytes_overflow() {
     let mut buf = SmallVec::with_capacity(8);
     buf.put_int(0x1020304050607080, 9);
@@ -74,7 +74,7 @@ fn test_put_int_le() {
 }
 
 #[test]
-#[should_panic(expected = "cannot write")]
+#[should_panic(expected = "size too large")]
 fn test_put_int_le_nbytes_overflow() {
     let mut buf = SmallVec::with_capacity(8);
     buf.put_int_le(0x1020304050607080, 9);