Improve assert! and test with custom message.

accounts-db/src/tiered_storage/hot.rs

@@ -285,7 +285,10 @@ impl HotStorageReader {
 
         assert!(
             offset.saturating_add(std::mem::size_of::<HotAccountMeta>())
-                <= self.footer.index_block_offset as usize
+                <= self.footer.index_block_offset as usize,
+            "HotAccountOffset ({}) exceeds accounts blocks offset boundary ({}).",
+            offset.saturating_add(std::mem::size_of::<HotAccountMeta>()),
+            self.footer.index_block_offset,
         );
         let (meta, _) = get_pod::<HotAccountMeta>(&self.mmap, offset)?;
         Ok(meta)
@@ -576,7 +579,7 @@ pub mod tests {
     }
 
     #[test]
-    #[should_panic(expected = "self.footer.index_block_offset")]
+    #[should_panic(expected = "exceeds accounts blocks offset boundary")]
     fn test_get_acount_meta_from_offset_out_of_bounds() {
         // Generate a new temp path that is guaranteed to NOT already have a file.
         let temp_dir = TempDir::new().unwrap();