test: use tcm in test_modify_chat_lost

Author: link2xt

src/chat.rs

@@ -5318,7 +5318,8 @@ mod tests {
     /// Test that group updates are robust to lost messages and eventual out of order arrival.
     #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
     async fn test_modify_chat_lost() -> Result<()> {
-        let alice = TestContext::new_alice().await;
+        let mut tcm = TestContextManager::new();
+        let alice = tcm.alice().await;
 
         let bob_id = Contact::create(&alice, "", "bob@example.net").await?;
         let claire_id = Contact::create(&alice, "", "claire@foo.de").await?;
@@ -5340,7 +5341,7 @@ mod tests {
         remove_contact_from_chat(&alice, alice_chat_id, daisy_id).await?;
         let remove2 = alice.pop_sent_msg().await;
 
-        let bob = TestContext::new_bob().await;
+        let bob = tcm.bob().await;
 
         bob.recv_msg(&add).await;
         let bob_chat_id = bob.get_last_msg().await.chat_id;