wip: introduce serde_test token matching

Co-authored-by: Carlo Federico Vescovo <cfvescovo@users.noreply.github.com>

Cargo.toml

@@ -21,3 +21,4 @@ serde = { version = "1.0.209", optional = true }
 [dev-dependencies]
 serde = "1.0.209"
 serde_json = "1.0.127"
+serde_test = "1.0.177"

src/serde.rs

@@ -27,7 +27,7 @@ impl<'a, T: Serialize> Serialize for SerNode<'a, T> {
     where
         S: serde::Serializer,
     {
-        let mut state = serializer.serialize_struct("SerNode", 2)?;
+        let mut state = serializer.serialize_struct("Node", 2)?;
         state.serialize_field("value", &self.value)?;
         state.serialize_field("children", &self.children)?;
         state.end()
@@ -93,7 +93,7 @@ where
     type Value = DeserNode<T>;
 
     fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        formatter.write_str("struct DeserNode")
+        formatter.write_str("struct Node")
     }
 
     fn visit_map<M>(self, mut map: M) -> Result<Self::Value, M::Error>
@@ -138,11 +138,7 @@ where
     where
         D: Deserializer<'de>,
     {
-        deserializer.deserialize_struct(
-            "DeserNode",
-            &["value", "children"],
-            DeserNodeVisitor::new(),
-        )
+        deserializer.deserialize_struct("Node", &["value", "children"], DeserNodeVisitor::new())
     }
 }
 

tests/serde.rs

@@ -1,6 +1,7 @@
 #![cfg(feature = "serde")]
 
 use ego_tree::{tree, Tree};
+use serde_test::{assert_tokens, Token};
 
 #[test]
 fn test_serde_round_trip() {
@@ -11,3 +12,24 @@ fn test_serde_round_trip() {
     println!("{re_tree}");
     assert_eq!(tree, re_tree);
 }
+
+#[test]
+fn test_internal_serde_repr() {
+    let tree = tree!("a");
+
+    assert_tokens(
+        &tree,
+        &[
+            Token::Struct {
+                name: "Node",
+                len: 2,
+            },
+            Token::Str("value"),
+            Token::Str("a"),
+            Token::Str("children"),
+            Token::Seq { len: Some(0) },
+            Token::SeqEnd,
+            Token::StructEnd,
+        ],
+    );
+}