feat: add rust serde example

.gitignore

@@ -16,6 +16,7 @@ node_modules
 
 /lib
 /lib-commonjs
+/rust/target
 
 # ----------------------------------------------------------------------------------------------------------------- Test
 

rust/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0.188", features = ["derive"] }
+serde_json = "1.0.107"

rust/src/main.rs

@@ -0,0 +1,5 @@
+mod serde;
+
+fn main() {
+    println!("Hello, world!");
+}

rust/src/serde.rs

@@ -0,0 +1,30 @@
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_result_to_json() -> serde_json::Result<()> {
+        let result1: Result<i32, &str> = Ok(1);
+        let result2: Result<i32, &str> = Err("Some error message");
+
+        let json1 = serde_json::to_string(&result1)?;
+        let json2 = serde_json::to_string(&result2)?;
+
+        assert_eq!(json1.as_str(), "{\"Ok\":1}");
+        assert_eq!(json2.as_str(), "{\"Err\":\"Some error message\"}");
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_result_from_json() -> serde_json::Result<()> {
+        let str1 = "{\"Ok\":1}";
+        let str2 = "{\"Err\":\"Some error message\"}";
+
+        let result1: Result<i32, &str> = serde_json::from_str(str1)?;
+        let result2: Result<i32, &str> = serde_json::from_str(str2)?;
+
+        assert_eq!(result1, Ok(1));
+        assert_eq!(result2, Err("Some error message"));
+
+        Ok(())
+    }
+}