Create and use some test helper functions

src/dc_receive_imf.rs

@@ -2164,7 +2164,6 @@ mod tests {
         // create alice's account
         let t = TestContext::new_alice().await;
 
-        // create one-to-one with bob, archive one-to-one
         let bob_id = Contact::create(&t.ctx, "bob", "bob@example.com")
             .await
             .unwrap();