[Rust]internalのfinalizeを実装した (VOICEVOX#160)

finalizeを実装した

crates/voicevox_core/src/internal.rs

@@ -99,7 +99,8 @@ impl Internal {
         }
     }
     pub fn finalize(&mut self) {
-        unimplemented!()
+        self.initialized = false;
+        self.status_option = None;
     }
     pub fn metas(&self) -> &'static CStr {
         &METAS_CSTRING
@@ -363,6 +364,16 @@ mod tests {
     use super::*;
     use pretty_assertions::assert_eq;
 
+    #[rstest]
+    fn finalize_works() {
+        let internal = Internal::new_with_mutex();
+        let result = internal.lock().unwrap().initialize(false, 0, false);
+        assert_eq!(Ok(()), result);
+        internal.lock().unwrap().finalize();
+        assert_eq!(false, internal.lock().unwrap().initialized);
+        assert_eq!(true, internal.lock().unwrap().status_option.is_none());
+    }
+
     #[rstest]
     #[case(0, Err(Error::UninitializedStatus), Ok(()))]
     #[case(1, Err(Error::UninitializedStatus), Ok(()))]