test: MDN on pre-message has effect if received before sending full message (#8004)

This currently fails: after sending the full message, the message state is `OutDelivered` like if
there was no MDN.

Author: iequidoo

src/config.rs

@@ -427,6 +427,10 @@ pub enum Config {
     /// storing the same token multiple times on the server.
     EncryptedDeviceToken,
 
+    /// Make `TestContext::pop_sent_msg_opt()` and related functions pop messages from the `smtp`
+    /// head, i.e. make it a queue. For historical reasons the default is a stack.
+    PopSentMsgFromHead,
+
     /// Enables running test hooks, e.g. see `InnerContext::pre_encrypt_mime_hook`.
     /// This way is better than conditional compilation, i.e. `#[cfg(test)]`, because tests not
     /// using this still run unmodified code.

src/test_utils.rs

@@ -624,16 +624,25 @@ impl TestContext {
     }
 
     pub async fn pop_sent_msg_opt(&self, timeout: Duration) -> Option<SentMessage<'_>> {
+        let from_head = self
+            .get_config_bool(Config::PopSentMsgFromHead)
+            .await
+            .unwrap();
+        let order_subst = match from_head {
+            true => "",
+            false => " DESC",
+        };
         let start = Instant::now();
         let (rowid, msg_id, payload, recipients) = loop {
             let row = self
                 .ctx
                 .sql
                 .query_row_optional(
-                    r#"
-                    SELECT id, msg_id, mime, recipients
-                    FROM smtp
-                    ORDER BY id DESC"#,
+                    &format!(
+                        "SELECT id, msg_id, mime, recipients
+FROM smtp
+ORDER BY id{order_subst}"
+                    ),
                     (),
                     |row| {
                         let rowid: i64 = row.get(0)?;

src/tests/pre_messages/receiving.rs

@@ -4,6 +4,7 @@ use pretty_assertions::assert_eq;
 
 use crate::EventType;
 use crate::chat;
+use crate::config::Config;
 use crate::contact;
 use crate::download::{DownloadState, PRE_MSG_ATTACHMENT_SIZE_THRESHOLD, PostMsgMetadata};
 use crate::message::{Message, MessageState, Viewtype, delete_msgs, markseen_msgs};
@@ -253,6 +254,49 @@ async fn test_lost_pre_msg() -> Result<()> {
     Ok(())
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn test_pre_msg_mdn() -> Result<()> {
+    let mut tcm = TestContextManager::new();
+    let alice = &tcm.alice().await;
+    alice
+        .set_config_bool(Config::PopSentMsgFromHead, true)
+        .await?;
+    let bob = &tcm.bob().await;
+    let alice_chat_id = alice.create_group_with_members("", &[bob]).await;
+
+    let file_bytes = include_bytes!("../../../test-data/image/screenshot.gif");
+    let mut msg = Message::new(Viewtype::Image);
+    msg.set_file_from_bytes(alice, "a.jpg", file_bytes, None)?;
+    msg.set_text("populate".to_string());
+    let pre_msg = alice.send_msg(alice_chat_id, &mut msg).await;
+    let alice_msg_id = msg.id;
+
+    let msg = bob.recv_msg(&pre_msg).await;
+    assert_eq!(msg.download_state, DownloadState::Available);
+    assert_eq!(msg.id.get_state(bob).await?, MessageState::InFresh);
+    assert_eq!(msg.text, "populate");
+    markseen_msgs(bob, vec![msg.id]).await?;
+    assert_eq!(msg.id.get_state(bob).await?, MessageState::InSeen);
+    assert_eq!(
+        bob.sql.count("SELECT COUNT(*) FROM smtp_mdns", ()).await?,
+        1
+    );
+    smtp::queue_mdn(bob).await?;
+    alice.recv_msg_trash(&bob.pop_sent_msg().await).await;
+    assert_eq!(
+        alice_msg_id.get_state(alice).await?,
+        MessageState::OutPending
+    );
+
+    let _full_msg = alice.pop_sent_msg().await;
+    // BUG: Must be `OutMdnRcvd`
+    assert_eq!(
+        alice_msg_id.get_state(alice).await?,
+        MessageState::OutDelivered
+    );
+    Ok(())
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn test_post_msg_bad_sender() -> Result<()> {
     let mut tcm = TestContextManager::new();