From 5fb5318714ba0594e05f2a133344065b2eaf1bf6 Mon Sep 17 00:00:00 2001
From: Ed Page <eopage@gmail.com>
Date: Fri, 8 Sep 2023 20:02:37 -0500
Subject: [PATCH] test(ser): Show existing enum behavior

---
 crates/toml/tests/testsuite/serde.rs | 46 ++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/crates/toml/tests/testsuite/serde.rs b/crates/toml/tests/testsuite/serde.rs
index 03b40259..cec3f95f 100644
--- a/crates/toml/tests/testsuite/serde.rs
+++ b/crates/toml/tests/testsuite/serde.rs
@@ -1174,3 +1174,49 @@ y = 7
     let raw = toml::to_string(&input).unwrap();
     snapbox::assert_eq(expected, raw);
 }
+
+#[test]
+fn serialize_array_with_enum_of_optional_struct_field() {
+    #[derive(Debug, Deserialize, Serialize)]
+    struct Document {
+        values: Vec<Choice>,
+    }
+
+    #[derive(Debug, Deserialize, Serialize)]
+    enum Choice {
+        Optional(OptionalField),
+        Empty,
+    }
+
+    #[derive(Debug, Deserialize, Serialize)]
+    struct OptionalField {
+        x: u8,
+        y: Option<u8>,
+    }
+
+    let input = Document {
+        values: vec![
+            Choice::Optional(OptionalField { x: 0, y: Some(4) }),
+            Choice::Empty,
+            Choice::Optional(OptionalField { x: 2, y: Some(5) }),
+            Choice::Optional(OptionalField { x: 3, y: Some(7) }),
+        ],
+    };
+    let expected = "values = [{}, \"Empty\", {}, {}]
+";
+    let raw = toml::to_string(&input).unwrap();
+    snapbox::assert_eq(expected, raw);
+
+    let input = Document {
+        values: vec![
+            Choice::Optional(OptionalField { x: 0, y: Some(4) }),
+            Choice::Empty,
+            Choice::Optional(OptionalField { x: 2, y: None }),
+            Choice::Optional(OptionalField { x: 3, y: Some(7) }),
+        ],
+    };
+    let expected = "values = [{}, \"Empty\", {}, {}]
+";
+    let raw = toml::to_string(&input).unwrap();
+    snapbox::assert_eq(expected, raw);
+}