chatdatabase: implements all_conversations with participant zippering

kordophone-db/src/lib.rs

@@ -83,4 +83,42 @@ mod tests {
 
         assert_eq!(participants, read_participants);
     }
+
+    #[test]
+    fn test_all_conversations_with_participants() {
+        let mut db = ChatDatabase::new_in_memory().unwrap();
+
+        // Create two conversations with different participants
+        let participants1: Vec<Participant> = vec!["one".into(), "two".into()];
+        let participants2: Vec<Participant> = vec!["three".into(), "four".into()];
+
+        let guid1 = uuid::Uuid::new_v4().to_string();
+        let conversation1 = ConversationBuilder::new()
+            .guid(&guid1)
+            .display_name("Test 1")
+            .participants(participants1.clone())
+            .build();
+
+        let guid2 = uuid::Uuid::new_v4().to_string();
+        let conversation2 = ConversationBuilder::new()
+            .guid(&guid2)
+            .display_name("Test 2")
+            .participants(participants2.clone())
+            .build();
+
+        // Insert both conversations
+        db.insert_conversation(conversation1).unwrap();
+        db.insert_conversation(conversation2).unwrap();
+
+        // Get all conversations and verify the results
+        let all_conversations = db.all_conversations().unwrap();
+        assert_eq!(all_conversations.len(), 2);
+
+        // Find and verify each conversation's participants
+        let conv1 = all_conversations.iter().find(|c| c.guid == guid1).unwrap();
+        let conv2 = all_conversations.iter().find(|c| c.guid == guid2).unwrap();
+
+        assert_eq!(conv1.participants, participants1);
+        assert_eq!(conv2.participants, participants2);
+    }
 }