pass down serialization feature to evercrypt

This isn't actually needed in here. But this might make problems
with consumers of the library down the chain that want to use
evercrypt with this feature.

Cargo.toml

@@ -19,7 +19,7 @@ evercrypt-sys = { git = "https://github.com/franziskuskiefer/evercrypt-rust", pa
 
 [features]
 rust-crypto = ["evercrypt/rust-crypto-aes"]
-serialization = ["serde", "serde_json"]
+serialization = ["serde", "serde_json", "evercrypt/serialization"]
 hazmat = []
 
 [dev-dependencies]

tests/test_features.rs

@@ -0,0 +1,24 @@
+#[cfg(feature = "serialization")]
+use evercrypt::prelude::*;
+
+#[cfg(feature = "serialization")]
+use hpke::prelude::*;
+
+#[test]
+#[cfg(feature = "serialization")]
+fn test_serialization() {
+    let hpke = Hpke::new(
+        HpkeMode::Base,
+        HpkeKemMode::DhKem25519,
+        HpkeKdfMode::HkdfSha256,
+        HpkeAeadMode::AesGcm256,
+    );
+    let hpke_serialized = serde_json::to_string(&hpke).unwrap();
+    let hpke_out: Hpke = serde_json::from_str(&hpke_serialized).unwrap();
+    assert_eq!(format!("{}", hpke), format!("{}", hpke_out));
+
+    let aead_mode = AeadMode::Aes256Gcm;
+    let serialized_mode = serde_json::to_string(&aead_mode).unwrap();
+    let aead_mode_out: AeadMode = serde_json::from_str(&serialized_mode).unwrap();
+    assert_eq!(aead_mode, aead_mode_out);
+}