Add tests

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 = []

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);
+    }
+}

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,