feat: update serde json test

__serialization/serde_json/src/main.rs

@@ -55,6 +55,18 @@ struct TestStruct2 {
     test_description: Option<String>,
 }
 
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum StringOrStringArray {
+    String(String),
+    Vec(Vec<String>),
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+struct TestStruct3 {
+    sub: StringOrStringArray,
+}
+
 fn main() -> Result<()> {
     let serialized = serde_json::to_string(&TestStruct{
         ty: TestEnum::TypeA,
@@ -85,7 +97,7 @@ fn main() -> Result<()> {
     });
     println!("{}", &john);
 
-    if let Option::Some(ref mut m) = john.as_object_mut() {
+    if let Some(ref mut m) = john.as_object_mut() {
         m.insert("test".into(), Value::Bool(true));
         m.insert("test2".into(), Value::String("hello world".into()));
     }
@@ -98,5 +110,11 @@ fn main() -> Result<()> {
     };
     println!("{}", serde_json::to_string(&test_struct2)?);
 
+    println!();
+    let test_struct3_1: TestStruct3 = serde_json::from_str("{\"sub\": \"name\"}")?;
+    println!("{}", serde_json::to_string_pretty(&test_struct3_1)?);
+    let test_struct3_2: TestStruct3 = serde_json::from_str("{\"sub\": [\"name1\", \"name2\"]}")?;
+    println!("{}", serde_json::to_string_pretty(&test_struct3_2)?);
+
     Ok(())
 }