test: If a message implicitly adds a group member, both messages appear (#4987)

src/chat.rs

@@ -4680,6 +4680,37 @@ mod tests {
         Ok(())
     }
 
+    /// Test that if a message implicitly adds a member, both messages appear.
+    #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+    async fn test_msg_with_implicit_member_add() -> Result<()> {
+        let mut tcm = TestContextManager::new();
+        let alice = tcm.alice().await;
+        let bob = tcm.bob().await;
+        let alice_bob_contact_id =
+            Contact::create(&alice, "Bob", &bob.get_config(Config::Addr).await?.unwrap()).await?;
+        let fiona_addr = "fiona@example.net";
+        let alice_fiona_contact_id = Contact::create(&alice, "Fiona", fiona_addr).await?;
+        let bob_fiona_contact_id = Contact::create(&bob, "Fiona", fiona_addr).await?;
+        let alice_chat_id =
+            create_group_chat(&alice, ProtectionStatus::Unprotected, "Group chat").await?;
+        add_contact_to_chat(&alice, alice_chat_id, alice_bob_contact_id).await?;
+        let sent_msg = alice.send_text(alice_chat_id, "I created a group").await;
+        let bob_received_msg = bob.recv_msg(&sent_msg).await;
+        let bob_chat_id = bob_received_msg.get_chat_id();
+        bob_chat_id.accept(&bob).await?;
+
+        add_contact_to_chat(&alice, alice_chat_id, alice_fiona_contact_id).await?;
+        let sent_msg = alice.pop_sent_msg().await;
+        bob.recv_msg(&sent_msg).await;
+        remove_contact_from_chat(&bob, bob_chat_id, bob_fiona_contact_id).await?;
+
+        let sent_msg = alice.send_text(alice_chat_id, "Welcome, Fiona!").await;
+        bob.recv_msg(&sent_msg).await;
+        bob.golden_test_chat(bob_chat_id, "chat_test_msg_with_implicit_member_add")
+            .await;
+        Ok(())
+    }
+
     #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
     async fn test_modify_chat_multi_device() -> Result<()> {
         let a1 = TestContext::new_alice().await;