From 09f64978102d7611050f033df9ffecd087509c02 Mon Sep 17 00:00:00 2001
From: Yuki Okushi <huyuumi.dev@gmail.com>
Date: Thu, 29 Jan 2026 21:45:09 +0900
Subject: [PATCH] add tests

---
 actix-multipart/CHANGES.md      |  2 ++
 actix-multipart/src/form/mod.rs | 34 +++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/actix-multipart/CHANGES.md b/actix-multipart/CHANGES.md
index 206374bf0..727cb897f 100644
--- a/actix-multipart/CHANGES.md
+++ b/actix-multipart/CHANGES.md
@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Minimum supported Rust version (MSRV) is now 1.83.
+- Add `MultipartForm` support for `Option<Vec<T>>` fields. [#3577]
 
 ## 0.7.2
 
@@ -82,6 +83,7 @@
 - `MultipartError` is now marked as non-exhaustive. [#2451]
 
 [#2451]: https://github.com/actix/actix-web/pull/2451
+[#3577]: https://github.com/actix/actix-web/pull/3577
 
 ## 0.4.0-beta.7
 
diff --git a/actix-multipart/src/form/mod.rs b/actix-multipart/src/form/mod.rs
index e596573c7..cb89b7cc1 100644
--- a/actix-multipart/src/form/mod.rs
+++ b/actix-multipart/src/form/mod.rs
@@ -545,6 +545,40 @@ mod tests {
         assert_eq!(response.status(), StatusCode::OK);
     }
 
+    /// Test `Option<Vec>` fields.
+    #[derive(MultipartForm)]
+    struct TestOptionVec {
+        list1: Option<Vec<Text<String>>>,
+        list2: Option<Vec<Text<String>>>,
+    }
+
+    async fn test_option_vec_route(form: MultipartForm<TestOptionVec>) -> impl Responder {
+        let form = form.into_inner();
+        let strings = form
+            .list1
+            .unwrap()
+            .into_iter()
+            .map(|s| s.into_inner())
+            .collect::<Vec<_>>();
+        assert_eq!(strings, vec!["value1", "value2", "value3"]);
+        assert!(form.list2.is_none());
+        HttpResponse::Ok().finish()
+    }
+
+    #[actix_rt::test]
+    async fn test_option_vec() {
+        let srv =
+            actix_test::start(|| App::new().route("/", web::post().to(test_option_vec_route)));
+
+        let mut form = multipart::Form::default();
+        form.add_text("list1", "value1");
+        form.add_text("list1", "value2");
+        form.add_text("list1", "value3");
+
+        let response = send_form(&srv, form, "/").await;
+        assert_eq!(response.status(), StatusCode::OK);
+    }
+
     /// Test the `rename` field attribute.
     #[derive(MultipartForm)]
     struct TestFieldRenaming {