Start work on restoring server-side code for chat messages

crates/collab/src/db/tests/message_tests.rs

@@ -0,0 +1,53 @@
+use crate::{
+    db::{Database, NewUserParams},
+    test_both_dbs,
+};
+use std::sync::Arc;
+use time::OffsetDateTime;
+
+test_both_dbs!(
+    test_channel_message_nonces,
+    test_channel_message_nonces_postgres,
+    test_channel_message_nonces_sqlite
+);
+
+async fn test_channel_message_nonces(db: &Arc<Database>) {
+    let user = db
+        .create_user(
+            "user@example.com",
+            false,
+            NewUserParams {
+                github_login: "user".into(),
+                github_user_id: 1,
+                invite_count: 0,
+            },
+        )
+        .await
+        .unwrap()
+        .user_id;
+    let channel = db
+        .create_channel("channel", None, "room", user)
+        .await
+        .unwrap();
+
+    let msg1_id = db
+        .create_channel_message(channel, user, "1", OffsetDateTime::now_utc(), 1)
+        .await
+        .unwrap();
+    let msg2_id = db
+        .create_channel_message(channel, user, "2", OffsetDateTime::now_utc(), 2)
+        .await
+        .unwrap();
+    let msg3_id = db
+        .create_channel_message(channel, user, "3", OffsetDateTime::now_utc(), 1)
+        .await
+        .unwrap();
+    let msg4_id = db
+        .create_channel_message(channel, user, "4", OffsetDateTime::now_utc(), 2)
+        .await
+        .unwrap();
+
+    assert_ne!(msg1_id, msg2_id);
+    assert_eq!(msg1_id, msg3_id);
+    assert_eq!(msg2_id, msg4_id);
+}