std: add tests for decoding json enums

src/libstd/json.rs

@@ -851,7 +851,6 @@ fn read_managed<T>(&self, f: &fn() -> T) -> T {
 
     fn read_enum<T>(&self, name: &str, f: &fn() -> T) -> T {
         debug!("read_enum(%s)", name);
-        if name != ~"option" { fail!(~"only supports the option enum") }
         f()
     }
 
@@ -1720,6 +1719,20 @@ fn test_read_some() {
         assert_eq!(value, Some(~"jodhpurs"));
     }
 
+    #[test]
+    fn test_read_enum_no_args() {
+        let decoder = Decoder(from_str(~"\"Dog\"").unwrap());
+        let value: Animal = Decodable::decode(&decoder);
+        assert_eq!(value, Dog);
+    }
+
+    #[test]
+    fn test_read_enum_multiple_args() {
+        let decoder = Decoder(from_str(~"[\"Frog\",\"Henry\",349]").unwrap());
+        let value: Animal = Decodable::decode(&decoder);
+        assert_eq!(value, Frog(~"Henry", 349));
+    }
+
     #[test]
     fn test_multiline_errors() {
         assert_eq!(from_str(~"{\n  \"foo\":\n \"bar\""),