From 047b552e3be7c14de989cf9fcbe0bd639c5e63ac Mon Sep 17 00:00:00 2001
From: "Shane F. Carr" <shane@unicode.org>
Date: Thu, 7 Mar 2024 18:14:54 +0100
Subject: [PATCH] Add tests

---
 Cargo.lock                          |  2 ++
 utils/pattern/Cargo.toml            |  2 ++
 utils/pattern/src/frontend/serde.rs | 36 +++++++++++++++++++++++++++++
 utils/pattern/src/single.rs         |  1 +
 4 files changed, 41 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index e179a401424..94483fd05ab 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1604,7 +1604,9 @@ version = "0.1.5"
 dependencies = [
  "databake",
  "displaydoc",
+ "postcard",
  "serde",
+ "serde_json",
  "writeable",
  "yoke",
  "zerofrom",
diff --git a/utils/pattern/Cargo.toml b/utils/pattern/Cargo.toml
index 39c90ffd54c..6f783d8ea37 100644
--- a/utils/pattern/Cargo.toml
+++ b/utils/pattern/Cargo.toml
@@ -31,6 +31,8 @@ zerofrom = { workspace = true, features = ["derive"], optional = true }
 [dev-dependencies]
 zerofrom = { workspace = true, features = ["alloc"] }
 zerovec = { workspace = true, features = ["databake", "serde"] }
+serde_json = { version = "1.0" }
+postcard = { version = "1.0", features = ["use-std"] }
 
 [features]
 alloc = []
diff --git a/utils/pattern/src/frontend/serde.rs b/utils/pattern/src/frontend/serde.rs
index 1222e634a86..ebd55bc9923 100644
--- a/utils/pattern/src/frontend/serde.rs
+++ b/utils/pattern/src/frontend/serde.rs
@@ -62,3 +62,39 @@ where
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::SinglePlaceholderPattern;
+
+    #[test]
+    fn test_json() {
+        let pattern_owned = SinglePlaceholderPattern::try_from_str("Hello, {0}!").unwrap();
+        let pattern_cow: SinglePlaceholderPattern<Cow<str>> =
+            SinglePlaceholderPattern::from_store_unchecked(Cow::Owned(pattern_owned.take_store()));
+        let pattern_json = serde_json::to_string(&pattern_cow).unwrap();
+        assert_eq!(
+            pattern_json,
+            r#"[{"Literal":"Hello, "},{"Placeholder":"Singleton"},{"Literal":"!"}]"#
+        );
+        let pattern_deserialized: SinglePlaceholderPattern<Cow<str>> =
+            serde_json::from_str(&pattern_json).unwrap();
+        assert_eq!(pattern_cow, pattern_deserialized);
+    }
+
+    #[test]
+    fn test_postcard() {
+        let pattern_owned = SinglePlaceholderPattern::try_from_str("Hello, {0}!").unwrap();
+        let pattern_cow: SinglePlaceholderPattern<Cow<str>> =
+            SinglePlaceholderPattern::from_store_unchecked(Cow::Owned(pattern_owned.take_store()));
+        let pattern_postcard = postcard::to_stdvec(&pattern_cow).unwrap();
+        assert_eq!(
+            pattern_postcard,
+            b"\x09\x08Hello, !"
+        );
+        let pattern_deserialized: SinglePlaceholderPattern<Cow<str>> =
+            postcard::from_bytes(&pattern_postcard).unwrap();
+        assert_eq!(pattern_cow, pattern_deserialized);
+    }
+}
diff --git a/utils/pattern/src/single.rs b/utils/pattern/src/single.rs
index 0dd57565101..b26b6362942 100644
--- a/utils/pattern/src/single.rs
+++ b/utils/pattern/src/single.rs
@@ -41,6 +41,7 @@ use alloc::string::String;
 /// );
 /// ```
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
+#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[allow(clippy::exhaustive_enums)] // Singleton
 pub enum SinglePlaceholderKey {
     Singleton,