Fix test_cc_to_contact

Author: link2xt

src/receive_imf/tests.rs

@@ -595,6 +595,8 @@ async fn test_escaped_recipients() {
     assert_eq!(msg.param.get_int(Param::WantsMdn).unwrap(), 1);
 }
 
+/// Tests that `Cc` header updates display name
+/// if existing contact has low enough origin.
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn test_cc_to_contact() {
     let t = TestContext::new_alice().await;
@@ -612,6 +614,8 @@ async fn test_cc_to_contact() {
     .unwrap()
     .0;
 
+    // We use non-chat message here
+    // because chat messages are not expected to have `Cc` header.
     receive_imf(
         &t,
         b"Received: (Postfix, from userid 1000); Mon, 4 Dec 2006 14:51:39 +0100 (CET)\n\
@@ -620,8 +624,6 @@ async fn test_cc_to_contact() {
                  Cc: Carl <carl@host.tld>\n\
                  Subject: foo\n\
                  Message-ID: <asdklfjjaweofi@example.com>\n\
-                 Chat-Version: 1.0\n\
-                 Chat-Disposition-Notification-To: <foobar@example.com>\n\
                  Date: Sun, 22 Mar 2020 22:37:57 +0000\n\
                  \n\
                  hello\n",