actually set set enum variant when deserializing

tests/enum.rs

@@ -5,7 +5,7 @@ use serde::{Deserialize, Serialize};
 use std::str::from_utf8;
 
 /// Description
-#[derive(Default, ConfigEnum, Serialize, Deserialize)]
+#[derive(Debug, Default, PartialEq, Eq, ConfigEnum, Serialize, Deserialize)]
 enum Test {
     #[default]
     Variant1,
@@ -56,4 +56,7 @@ fn deserialize(
 
     let res = config.set_json(path, b"\"Variant3\"");
     assert_eq!(res, expected);
+    if res.is_ok() {
+        assert_eq!(config, Test::Variant3);
+    }
 }