Add serde tests using postcard

Author: tarcieri

.clippy.toml

@@ -0,0 +1,2 @@
+allow-unwrap-in-consts = true
+allow-unwrap-in-tests = true

Cargo.lock

@@ -28,6 +28,9 @@ subtle = { version = "2", optional = true, default-features = false, features =
 zeroize = { version = "1.8", optional = true, default-features = false }
 zerocopy = { version = "0.8", optional = true, features = ["derive"] }
 
+[dev-dependencies]
+postcard = { version = "1", default-features = false, features = ["alloc"] }
+
 [features]
 alloc = []
 extra-sizes = []

Cargo.toml

@@ -69,3 +69,17 @@ where
         seq.end()
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::{Array, sizes::U3};
+    type A = Array<u8, U3>;
+
+    #[test]
+    fn round_trip() {
+        let example: A = Array([1, 2, 3]);
+        let bytes = postcard::to_allocvec(&example).unwrap();
+        let deserialized: A = postcard::from_bytes(&bytes).unwrap();
+        assert_eq!(example, deserialized);
+    }
+}