test: Reply to protected group from MUA

This must be possible if a message is properly signed and encrypted.

src/receive_imf/tests.rs

@@ -4855,6 +4855,37 @@ async fn test_protected_group_add_remove_member_missing_key() -> Result<()> {
     Ok(())
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn test_protected_group_reply_from_mua() -> Result<()> {
+    let mut tcm = TestContextManager::new();
+    let alice = &tcm.alice().await;
+    let bob = &tcm.bob().await;
+    let fiona = &tcm.fiona().await;
+    mark_as_verified(alice, bob).await;
+    mark_as_verified(alice, fiona).await;
+    mark_as_verified(bob, alice).await;
+    let alice_chat_id = alice
+        .create_group_with_members(ProtectionStatus::Protected, "Group", &[bob, fiona])
+        .await;
+    let sent = alice.send_text(alice_chat_id, "Hello!").await;
+    let bob_msg = bob.recv_msg(&sent).await;
+    bob_msg.chat_id.accept(bob).await?;
+    // This is hacky, but i don't know other simple way to simulate a MUA reply. It works because
+    // the message is correctly assigned to the chat by `References:`.
+    bob.sql
+        .execute(
+            "UPDATE chats SET protected=0, grpid='' WHERE id=?",
+            (bob_msg.chat_id,),
+        )
+        .await?;
+    let sent = bob
+        .send_text(bob_msg.chat_id, "/me replying from MUA")
+        .await;
+    let alice_msg = alice.recv_msg(&sent).await;
+    assert_eq!(alice_msg.chat_id, alice_chat_id);
+    Ok(())
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn test_older_message_from_2nd_device() -> Result<()> {
     let mut tcm = TestContextManager::new();