Implement serde serialize

Author: MidasLamb

src/serde_support.rs

@@ -1,9 +1,21 @@
 use std::fmt;
 
-use serde::de::{self, Unexpected, Visitor};
+use serde::{
+    de::{self, Unexpected, Visitor},
+    ser::Serialize,
+};
 
 use crate::NonEmptyString;
 
+impl Serialize for NonEmptyString {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_str(self.get())
+    }
+}
+
 struct NonEmptyStringVisitor;
 
 impl<'de> de::Deserialize<'de> for NonEmptyString {
@@ -48,6 +60,17 @@ mod tests {
     use assert_matches::assert_matches;
     use serde_json::json;
 
+    #[test]
+    fn serialize_works() {
+        let value = NonEmptyString("abc".to_owned());
+        let result = serde_json::to_string(&value);
+
+        assert!(result.is_ok());
+
+        let json = serde_json::to_string(&json!("abc")).unwrap();
+        assert_eq!(result.unwrap(), json)
+    }
+
     #[test]
     fn deserialize_works() {
         let e: Result<NonEmptyString, _> = serde_json::from_value(json!("abc"));