test: Test the KnownSenderData migration with optimised [u8] serializ…

…ation

crates/matrix-sdk-crypto/Cargo.toml

@@ -87,6 +87,7 @@ http = { workspace = true }
 indoc = "2.0.5"
 insta = { workspace = true }
 matrix-sdk-test = { workspace = true }
+rmp-serde = { workspace = true }
 proptest = { workspace = true }
 similar-asserts = { workspace = true }
 # required for async_test macro

crates/matrix-sdk-crypto/src/olm/group_sessions/sender_data.rs

@@ -352,11 +352,11 @@ mod tests {
         device_id, owned_device_id, owned_user_id, user_id, DeviceKeyAlgorithm, DeviceKeyId,
     };
     use serde_json::json;
-    use vodozemac::{Curve25519PublicKey, Ed25519PublicKey};
+    use vodozemac::{base64_decode, Curve25519PublicKey, Ed25519PublicKey};
 
     use super::SenderData;
     use crate::{
-        olm::KnownSenderData,
+        olm::{KnownSenderData, PickledInboundGroupSession},
         types::{DeviceKey, DeviceKeys, EventEncryptionAlgorithm, Signatures},
     };
 
@@ -616,4 +616,36 @@ mod tests {
             Ed25519PublicKey::from_slice(&[0u8; 32]).unwrap().to_base64()
         );
     }
+
+    #[test]
+    fn test_sender_known_data_migration_with_efficient_bytes_array() {
+        // This is an serialized PickledInboundGroupSession as rmp_serde will generate.
+        //
+        // This export usse a more efficient serialization format for bytes. This was
+        // exported when the `KnownSenderData` master_key was serialized as an byte
+        // array instead of a base64 encoded string.
+        const SERIALIZED_B64: &str =
+            "iaZwaWNrbGWEr2luaXRpYWxfcmF0Y2hldIKlaW5uZXLcAIABYMzfSnBRzMlPKF1uKjYbzLtkzNJ4RcylzN0HzP\
+             9DzON1Tm05zO7M2MzFQsy9Acz9zPnMqDvM4syQzNrMzxF5KzbM4sy9zPUbBWfM7m4/zJzM18zDzMESKgfMkE7M\
+             yszIHszqWjYyQURbzKTMkx7M58zANsy+AGPM2A8tbcyFYczge8ykzMFdbVxJMMyAzN8azJEXGsy8zPJazMMaP8\
+             ziDszmWwfM+My2ajLMr8y+eczTRm9TFadjb3VudGVyAKtzaWduaW5nX2tlecQgefpCr6Duu7QUWzKIeMOFmxv/\
+             NjfcsYwZz8IN2ZOhdaS0c2lnbmluZ19rZXlfdmVyaWZpZWTDpmNvbmZpZ4GndmVyc2lvbqJWMapzZW5kZXJfa2\
+             V52StoMkIySDg2ajFpYmk2SW13ak9UUkhzbTVMamtyT2kyUGtiSXVUb0w0TWtFq3NpZ25pbmdfa2V5gadlZDI1\
+             NTE52StUWHJqNS9UYXpia3Yram1CZDl4UlB4NWNVaFFzNUNnblc1Q1pNRjgvNjZzq3NlbmRlcl9kYXRhgbBTZW\
+             5kZXJVbnZlcmlmaWVkg6d1c2VyX2lks0B2YWxvdTM1Om1hdHJpeC5vcmepZGV2aWNlX2lkqkZJQlNaRlJLUE2q\
+             bWFzdGVyX2tlecQgkOp9s4ClyQujYD7rRZA8xgE6kvYlqKSNnMrQNmSrcuGncm9vbV9pZL4hRWt5VEtGdkViYl\
+             B6SmxhaUhFOm1hdHJpeC5vcmeoaW1wb3J0ZWTCqWJhY2tlZF91cMKyaGlzdG9yeV92aXNpYmlsaXR5wKlhbGdv\
+             cml0aG20bS5tZWdvbG0udjEuYWVzLXNoYTI";
+
+        let input = base64_decode(SERIALIZED_B64).unwrap();
+        let sender_data: PickledInboundGroupSession = rmp_serde::from_slice(&input)
+            .expect("Should be able to deserialize serialized inbound group session");
+
+        assert_let!(
+            SenderData::SenderUnverified(KnownSenderData { master_key, .. }) =
+                sender_data.sender_data
+        );
+
+        assert_eq!(master_key.to_base64(), "kOp9s4ClyQujYD7rRZA8xgE6kvYlqKSNnMrQNmSrcuE");
+    }
 }