From 193040b15a09e6d8bb7d769bc6ee12ffa20e8d4a Mon Sep 17 00:00:00 2001
From: quininer <quininer@live.com>
Date: Sat, 25 Nov 2023 11:09:13 +0800
Subject: [PATCH] test: Add display length test

---
 Cargo.toml     |  4 ++--
 tests/serde.rs | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 7379be9..fb82b5c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cbor4ii"
-version = "0.3.1"
+version = "0.3.2"
 authors = ["quininer <quininer@live.com>"]
 description = "CBOR: Concise Binary Object Representation"
 repository = "https://github.com/quininer/cbor4ii"
@@ -26,7 +26,7 @@ serde_bytes = "0.11"
 data-encoding = "2"
 serde_cbor = "0.11"
 ciborium = "0.2"
-criterion = "0.4"
+criterion = "0.5"
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/tests/serde.rs b/tests/serde.rs
index 4f66527..8963156 100644
--- a/tests/serde.rs
+++ b/tests/serde.rs
@@ -479,3 +479,42 @@ fn test_regression_min_i64() {
     let min_i64: i64 = from_slice(&buf).unwrap();
     assert_eq!(min_i64, i64::MIN);
 }
+
+#[test]
+fn test_debug_ser_len() {
+    struct Test {
+        long: char,
+        short: char
+    }
+
+    impl fmt::Display for Test {
+        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+            let s = (0..257).map(|_| self.long).collect::<String>();
+            write!(f, "{}", s)?;
+
+            for _ in 0..257 {
+                write!(f, "{}", self.short)?;
+            }
+
+            Ok(())
+        }
+    }
+
+    impl Serialize for Test {
+        fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where
+            S: serde::Serializer,
+        {
+            serializer.collect_str(self)
+        }
+    }
+
+    let test = Test {
+        long: 'l',
+        short: 's'
+    };
+
+    let buf = to_vec(Vec::new(), &test).unwrap();
+    assert!(dbg!(buf.len()) < 777); // <= 0.3.1
+    assert!(dbg!(buf.len()) <= 523);
+}