fixup! Add some tests for ratchet counting

src/olm/session/double_ratchet.rs

@@ -339,21 +339,18 @@ mod test {
 
     fn create_session_pair(alice: &Account, bob: &mut Account) -> (Session, Session) {
         let bob_otks = bob.generate_one_time_keys(1);
-        let bob_otk = bob_otks.created.get(0).expect("Couldn't get a one-time-key for bob");
+        let bob_otk = bob_otks.created.first().expect("Couldn't get a one-time-key for bob");
         let bob_identity_key = bob.identity_keys().curve25519;
-        let mut alice_session = alice.create_outbound_session(
-            SessionConfig::version_1(),
-            bob_identity_key,
-            bob_otk.clone(),
-        );
+        let mut alice_session =
+            alice.create_outbound_session(SessionConfig::version_1(), bob_identity_key, *bob_otk);
 
         let message = "It's a secret to everybody";
         let olm_message = alice_session.encrypt(message);
         let prekey_message = assert_matches!(olm_message, OlmMessage::PreKey(m) => m);
 
         let alice_identity_key = alice.identity_keys().curve25519;
         let bob_session_creation_result = bob
-            .create_inbound_session(alice_identity_key.clone(), &prekey_message)
+            .create_inbound_session(alice_identity_key, &prekey_message)
             .expect("Unable to create inbound session");
         assert_eq!(bob_session_creation_result.plaintext, message.as_bytes());
         (alice_session, bob_session_creation_result.session)