Add cross-interface consistency tests

backend/crates/integration-tests/src/cross_interface_consistency_tests.rs

@@ -0,0 +1,604 @@
+/*
+ * This file is part of Sharenet.
+ * 
+ * Sharenet is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
+ * 
+ * You may obtain a copy of the license at:
+ * https://creativecommons.org/licenses/by-nc-sa/4.0/
+ * 
+ * Copyright (c) 2024 Continuist <continuist02@gmail.com>
+ */
+
+use application::{Service, UseCase};
+use domain::{CreateProduct, CreateUser, Product, UpdateProduct, UpdateUser, User};
+use memory::{InMemoryUserRepository, InMemoryProductRepository};
+use postgres::{PostgresUserRepository, PostgresProductRepository};
+use sqlx::PgPool;
+use sqlx::postgres::PgPoolOptions;
+use std::env;
+use uuid::Uuid;
+use serial_test::serial;
+
+// Helper functions for test setup
+async fn setup_test_db() -> PgPool {
+    // Explicitly set DATABASE_URL to use sharenet_test database
+    std::env::set_var("DATABASE_URL", "postgres://postgres:password@localhost:5432/sharenet_test");
+    
+    let database_url = env::var("DATABASE_URL")
+        .unwrap_or_else(|_| "postgres://postgres:password@localhost:5432/sharenet_test".to_string());
+    let pool = PgPoolOptions::new()
+        .max_connections(5)
+        .connect(&database_url)
+        .await
+        .expect("Failed to connect to test database");
+    sqlx::migrate!("../../migrations")
+        .run(&pool)
+        .await
+        .expect("Failed to run migrations");
+    cleanup_test_data(&pool).await;
+    pool
+}
+
+async fn cleanup_test_data(pool: &PgPool) {
+    let mut tx = pool.begin().await.expect("Failed to begin transaction");
+    sqlx::query("TRUNCATE TABLE products, users RESTART IDENTITY CASCADE").execute(&mut *tx).await.expect("Failed to truncate tables");
+    tx.commit().await.expect("Failed to commit cleanup transaction");
+    // Assert tables are empty
+    let users_count: (i64,) = sqlx::query_as("SELECT COUNT(*) FROM users").fetch_one(pool).await.expect("Failed to count users");
+    let products_count: (i64,) = sqlx::query_as("SELECT COUNT(*) FROM products").fetch_one(pool).await.expect("Failed to count products");
+    assert_eq!(users_count.0, 0, "Users table not empty after cleanup");
+    assert_eq!(products_count.0, 0, "Products table not empty after cleanup");
+}
+
+fn unique_test_data(prefix: &str) -> (String, String) {
+    let id = Uuid::new_v4().to_string();
+    (format!("{}_{}", prefix, id), format!("{}_{}@example.com", prefix, id))
+}
+
+// Test data structures for comparison
+#[derive(Debug, PartialEq, Clone)]
+struct UserData {
+    username: String,
+    email: String,
+}
+
+impl From<&User> for UserData {
+    fn from(user: &User) -> Self {
+        Self {
+            username: user.username().to_string(),
+            email: user.email().to_string(),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Clone)]
+struct ProductData {
+    name: String,
+    description: String,
+}
+
+impl From<&Product> for ProductData {
+    fn from(product: &Product) -> Self {
+        Self {
+            name: product.name().to_string(),
+            description: product.description().to_string(),
+        }
+    }
+}
+
+// Helper function to compare user lists (ignoring IDs and timestamps)
+fn compare_user_lists(users1: &[User], users2: &[User]) {
+    let data1: Vec<UserData> = users1.iter().map(UserData::from).collect();
+    let data2: Vec<UserData> = users2.iter().map(UserData::from).collect();
+    
+    assert_eq!(data1.len(), data2.len(), "User count mismatch");
+    
+    // Sort by username for consistent comparison
+    let mut sorted1 = data1.clone();
+    let mut sorted2 = data2.clone();
+    sorted1.sort_by(|a, b| a.username.cmp(&b.username));
+    sorted2.sort_by(|a, b| a.username.cmp(&b.username));
+    
+    assert_eq!(sorted1, sorted2, "User data mismatch");
+}
+
+// Helper function to compare product lists (ignoring IDs and timestamps)
+fn compare_product_lists(products1: &[Product], products2: &[Product]) {
+    let data1: Vec<ProductData> = products1.iter().map(ProductData::from).collect();
+    let data2: Vec<ProductData> = products2.iter().map(ProductData::from).collect();
+    
+    assert_eq!(data1.len(), data2.len(), "Product count mismatch");
+    
+    // Sort by name for consistent comparison
+    let mut sorted1 = data1.clone();
+    let mut sorted2 = data2.clone();
+    sorted1.sort_by(|a, b| a.name.cmp(&b.name));
+    sorted2.sort_by(|a, b| a.name.cmp(&b.name));
+    
+    assert_eq!(sorted1, sorted2, "Product data mismatch");
+}
+
+// Helper function to create services for different interfaces
+fn create_memory_services() -> (Service<User, InMemoryUserRepository>, Service<Product, InMemoryProductRepository>) {
+    let user_repo = InMemoryUserRepository::new();
+    let product_repo = InMemoryProductRepository::new();
+    let user_service = Service::new(user_repo);
+    let product_service = Service::new(product_repo);
+    (user_service, product_service)
+}
+
+fn create_postgres_services(pool: PgPool) -> (Service<User, PostgresUserRepository>, Service<Product, PostgresProductRepository>) {
+    let user_repo = PostgresUserRepository::new(pool.clone());
+    let product_repo = PostgresProductRepository::new(pool);
+    let user_service = Service::new(user_repo);
+    let product_service = Service::new(product_repo);
+    (user_service, product_service)
+}
+
+#[tokio::test]
+#[serial]
+async fn test_api_cli_consistency_with_memory() {
+    // Create services for both interfaces using memory backend
+    let (api_user_service, api_product_service) = create_memory_services();
+    let (cli_user_service, cli_product_service) = create_memory_services();
+
+    // Test data
+    let (username1, email1) = unique_test_data("api_cli_user1");
+    let (username2, email2) = unique_test_data("api_cli_user2");
+    let (name1, _) = unique_test_data("api_cli_product1");
+    let (name2, _) = unique_test_data("api_cli_product2");
+
+    // Test 1: Create users via API interface and capture state
+    let create_user1 = CreateUser::new(username1.clone(), email1.clone()).unwrap();
+    let create_user2 = CreateUser::new(username2.clone(), email2.clone()).unwrap();
+
+    let api_user1 = api_user_service.create(create_user1.clone()).await.unwrap();
+    let _api_user2 = api_user_service.create(create_user2.clone()).await.unwrap();
+    
+    let api_users_after_create = api_user_service.list().await.unwrap();
+    assert_eq!(api_users_after_create.len(), 2);
+
+    // Test 2: Create same users via CLI interface and compare
+    let cli_user1 = cli_user_service.create(create_user1).await.unwrap();
+    let _cli_user2 = cli_user_service.create(create_user2).await.unwrap();
+    
+    let cli_users_after_create = cli_user_service.list().await.unwrap();
+    assert_eq!(cli_users_after_create.len(), 2);
+    
+    // Compare user data (ignoring IDs and timestamps)
+    compare_user_lists(&api_users_after_create, &cli_users_after_create);
+
+    // Test 3: Create products via API interface and capture state
+    let create_product1 = CreateProduct::new(name1.clone(), "Description 1".to_string()).unwrap();
+    let create_product2 = CreateProduct::new(name2.clone(), "Description 2".to_string()).unwrap();
+
+    let api_product1 = api_product_service.create(create_product1.clone()).await.unwrap();
+    let _api_product2 = api_product_service.create(create_product2.clone()).await.unwrap();
+    
+    let api_products_after_create = api_product_service.list().await.unwrap();
+    assert_eq!(api_products_after_create.len(), 2);
+
+    // Test 4: Create same products via CLI interface and compare
+    let cli_product1 = cli_product_service.create(create_product1).await.unwrap();
+    let _cli_product2 = cli_product_service.create(create_product2).await.unwrap();
+    
+    let cli_products_after_create = cli_product_service.list().await.unwrap();
+    assert_eq!(cli_products_after_create.len(), 2);
+    
+    // Compare product data (ignoring IDs and timestamps)
+    compare_product_lists(&api_products_after_create, &cli_products_after_create);
+
+    // Test 5: Test that both interfaces can access the same data
+    let api_retrieved_user = api_user_service.get(api_user1.id()).await.unwrap();
+    let cli_retrieved_user = cli_user_service.get(cli_user1.id()).await.unwrap();
+    
+    assert_eq!(api_retrieved_user.username(), cli_retrieved_user.username());
+    assert_eq!(api_retrieved_user.email(), cli_retrieved_user.email());
+
+    let api_retrieved_product = api_product_service.get(api_product1.id()).await.unwrap();
+    let cli_retrieved_product = cli_product_service.get(cli_product1.id()).await.unwrap();
+    
+    assert_eq!(api_retrieved_product.name(), cli_retrieved_product.name());
+    assert_eq!(api_retrieved_product.description(), cli_retrieved_product.description());
+
+    // Test 6: Test update consistency - update same user via both interfaces
+    let update_user_data = UpdateUser::new(Some("updated_username".to_string()), Some("updated@example.com".to_string())).unwrap();
+    
+    let api_updated_user = api_user_service.update(api_user1.id(), update_user_data.clone()).await.unwrap();
+    let cli_updated_user = cli_user_service.update(cli_user1.id(), update_user_data).await.unwrap();
+    
+    assert_eq!(api_updated_user.username(), cli_updated_user.username());
+    assert_eq!(api_updated_user.email(), cli_updated_user.email());
+
+    // Test 7: Test delete consistency
+    api_user_service.delete(api_user1.id()).await.unwrap();
+    cli_user_service.delete(cli_user1.id()).await.unwrap();
+
+    let api_users_after_delete = api_user_service.list().await.unwrap();
+    let cli_users_after_delete = cli_user_service.list().await.unwrap();
+    
+    assert_eq!(api_users_after_delete.len(), 1);
+    assert_eq!(cli_users_after_delete.len(), 1);
+    compare_user_lists(&api_users_after_delete, &cli_users_after_delete);
+}
+
+#[tokio::test]
+#[serial]
+async fn test_api_tui_consistency_with_memory() {
+    // Create services for both interfaces using memory backend
+    let (api_user_service, api_product_service) = create_memory_services();
+    let (tui_user_service, tui_product_service) = create_memory_services();
+
+    // Test data
+    let (username1, email1) = unique_test_data("api_tui_user1");
+    let (username2, email2) = unique_test_data("api_tui_user2");
+    let (name1, _) = unique_test_data("api_tui_product1");
+    let (name2, _) = unique_test_data("api_tui_product2");
+
+    // Test 1: Create users via API interface and capture state
+    let create_user1 = CreateUser::new(username1.clone(), email1.clone()).unwrap();
+    let create_user2 = CreateUser::new(username2.clone(), email2.clone()).unwrap();
+
+    let api_user1 = api_user_service.create(create_user1.clone()).await.unwrap();
+    let _api_user2 = api_user_service.create(create_user2.clone()).await.unwrap();
+    
+    let api_users_after_create = api_user_service.list().await.unwrap();
+    assert_eq!(api_users_after_create.len(), 2);
+
+    // Test 2: Create same users via TUI interface and compare
+    let tui_user1 = tui_user_service.create(create_user1).await.unwrap();
+    let _tui_user2 = tui_user_service.create(create_user2).await.unwrap();
+    
+    let tui_users_after_create = tui_user_service.list().await.unwrap();
+    assert_eq!(tui_users_after_create.len(), 2);
+    
+    // Compare user data (ignoring IDs and timestamps)
+    compare_user_lists(&api_users_after_create, &tui_users_after_create);
+
+    // Test 3: Create products via API interface and capture state
+    let create_product1 = CreateProduct::new(name1.clone(), "Description 1".to_string()).unwrap();
+    let create_product2 = CreateProduct::new(name2.clone(), "Description 2".to_string()).unwrap();
+
+    let api_product1 = api_product_service.create(create_product1.clone()).await.unwrap();
+    let _api_product2 = api_product_service.create(create_product2.clone()).await.unwrap();
+    
+    let api_products_after_create = api_product_service.list().await.unwrap();
+    assert_eq!(api_products_after_create.len(), 2);
+
+    // Test 4: Create same products via TUI interface and compare
+    let tui_product1 = tui_product_service.create(create_product1).await.unwrap();
+    let _tui_product2 = tui_product_service.create(create_product2).await.unwrap();
+    
+    let tui_products_after_create = tui_product_service.list().await.unwrap();
+    assert_eq!(tui_products_after_create.len(), 2);
+    
+    // Compare product data (ignoring IDs and timestamps)
+    compare_product_lists(&api_products_after_create, &tui_products_after_create);
+
+    // Test 5: Test that both interfaces can access the same data
+    let api_retrieved_user = api_user_service.get(api_user1.id()).await.unwrap();
+    let tui_retrieved_user = tui_user_service.get(tui_user1.id()).await.unwrap();
+    
+    assert_eq!(api_retrieved_user.username(), tui_retrieved_user.username());
+    assert_eq!(api_retrieved_user.email(), tui_retrieved_user.email());
+
+    let api_retrieved_product = api_product_service.get(api_product1.id()).await.unwrap();
+    let tui_retrieved_product = tui_product_service.get(tui_product1.id()).await.unwrap();
+    
+    assert_eq!(api_retrieved_product.name(), tui_retrieved_product.name());
+    assert_eq!(api_retrieved_product.description(), tui_retrieved_product.description());
+
+    // Test 6: Test update consistency - update same user via both interfaces
+    let update_user_data = UpdateUser::new(Some("updated_username".to_string()), Some("updated@example.com".to_string())).unwrap();
+    
+    let api_updated_user = api_user_service.update(api_user1.id(), update_user_data.clone()).await.unwrap();
+    let tui_updated_user = tui_user_service.update(tui_user1.id(), update_user_data).await.unwrap();
+    
+    assert_eq!(api_updated_user.username(), tui_updated_user.username());
+    assert_eq!(api_updated_user.email(), tui_updated_user.email());
+
+    // Test 7: Test delete consistency
+    api_user_service.delete(api_user1.id()).await.unwrap();
+    tui_user_service.delete(tui_user1.id()).await.unwrap();
+
+    let api_users_after_delete = api_user_service.list().await.unwrap();
+    let tui_users_after_delete = tui_user_service.list().await.unwrap();
+    
+    assert_eq!(api_users_after_delete.len(), 1);
+    assert_eq!(tui_users_after_delete.len(), 1);
+    compare_user_lists(&api_users_after_delete, &tui_users_after_delete);
+}
+
+#[tokio::test]
+#[serial]
+async fn test_cli_tui_consistency_with_memory() {
+    // Create services for both interfaces using memory backend
+    let (cli_user_service, cli_product_service) = create_memory_services();
+    let (tui_user_service, tui_product_service) = create_memory_services();
+
+    // Test data
+    let (username1, email1) = unique_test_data("cli_tui_user1");
+    let (username2, email2) = unique_test_data("cli_tui_user2");
+    let (name1, _) = unique_test_data("cli_tui_product1");
+    let (name2, _) = unique_test_data("cli_tui_product2");
+
+    // Test 1: Create users via CLI interface and capture state
+    let create_user1 = CreateUser::new(username1.clone(), email1.clone()).unwrap();
+    let create_user2 = CreateUser::new(username2.clone(), email2.clone()).unwrap();
+
+    let cli_user1 = cli_user_service.create(create_user1.clone()).await.unwrap();
+    let _cli_user2 = cli_user_service.create(create_user2.clone()).await.unwrap();
+    
+    let cli_users_after_create = cli_user_service.list().await.unwrap();
+    assert_eq!(cli_users_after_create.len(), 2);
+
+    // Test 2: Create same users via TUI interface and compare
+    let tui_user1 = tui_user_service.create(create_user1).await.unwrap();
+    let _tui_user2 = tui_user_service.create(create_user2).await.unwrap();
+    
+    let tui_users_after_create = tui_user_service.list().await.unwrap();
+    assert_eq!(tui_users_after_create.len(), 2);
+    
+    // Compare user data (ignoring IDs and timestamps)
+    compare_user_lists(&cli_users_after_create, &tui_users_after_create);
+
+    // Test 3: Create products via CLI interface and capture state
+    let create_product1 = CreateProduct::new(name1.clone(), "Description 1".to_string()).unwrap();
+    let create_product2 = CreateProduct::new(name2.clone(), "Description 2".to_string()).unwrap();
+
+    let cli_product1 = cli_product_service.create(create_product1.clone()).await.unwrap();
+    let _cli_product2 = cli_product_service.create(create_product2.clone()).await.unwrap();
+    
+    let cli_products_after_create = cli_product_service.list().await.unwrap();
+    assert_eq!(cli_products_after_create.len(), 2);
+
+    // Test 4: Create same products via TUI interface and compare
+    let tui_product1 = tui_product_service.create(create_product1).await.unwrap();
+    let _tui_product2 = tui_product_service.create(create_product2).await.unwrap();
+    
+    let tui_products_after_create = tui_product_service.list().await.unwrap();
+    assert_eq!(tui_products_after_create.len(), 2);
+    
+    // Compare product data (ignoring IDs and timestamps)
+    compare_product_lists(&cli_products_after_create, &tui_products_after_create);
+
+    // Test 5: Test that both interfaces can access the same data
+    let cli_retrieved_user = cli_user_service.get(cli_user1.id()).await.unwrap();
+    let tui_retrieved_user = tui_user_service.get(tui_user1.id()).await.unwrap();
+    
+    assert_eq!(cli_retrieved_user.username(), tui_retrieved_user.username());
+    assert_eq!(cli_retrieved_user.email(), tui_retrieved_user.email());
+
+    let cli_retrieved_product = cli_product_service.get(cli_product1.id()).await.unwrap();
+    let tui_retrieved_product = tui_product_service.get(tui_product1.id()).await.unwrap();
+    
+    assert_eq!(cli_retrieved_product.name(), tui_retrieved_product.name());
+    assert_eq!(cli_retrieved_product.description(), tui_retrieved_product.description());
+
+    // Test 6: Test update consistency - update same user via both interfaces
+    let update_user_data = UpdateUser::new(Some("updated_username".to_string()), Some("updated@example.com".to_string())).unwrap();
+    
+    let cli_updated_user = cli_user_service.update(cli_user1.id(), update_user_data.clone()).await.unwrap();
+    let tui_updated_user = tui_user_service.update(tui_user1.id(), update_user_data).await.unwrap();
+    
+    assert_eq!(cli_updated_user.username(), tui_updated_user.username());
+    assert_eq!(cli_updated_user.email(), tui_updated_user.email());
+
+    // Test 7: Test delete consistency
+    cli_user_service.delete(cli_user1.id()).await.unwrap();
+    tui_user_service.delete(tui_user1.id()).await.unwrap();
+
+    let cli_users_after_delete = cli_user_service.list().await.unwrap();
+    let tui_users_after_delete = tui_user_service.list().await.unwrap();
+    
+    assert_eq!(cli_users_after_delete.len(), 1);
+    assert_eq!(tui_users_after_delete.len(), 1);
+    compare_user_lists(&cli_users_after_delete, &tui_users_after_delete);
+}
+
+#[tokio::test]
+#[serial]
+async fn test_api_cli_consistency_with_postgres() {
+    let pool = setup_test_db().await;
+    cleanup_test_data(&pool).await;
+    
+    // Double-check that the database is empty
+    let users_count: (i64,) = sqlx::query_as("SELECT COUNT(*) FROM users").fetch_one(&pool).await.expect("Failed to count users");
+    let products_count: (i64,) = sqlx::query_as("SELECT COUNT(*) FROM products").fetch_one(&pool).await.expect("Failed to count products");
+    println!("Database state before test: {} users, {} products", users_count.0, products_count.0);
+    assert_eq!(users_count.0, 0, "Users table not empty before test");
+    assert_eq!(products_count.0, 0, "Products table not empty before test");
+    
+    // Test data
+    let (username1, email1) = unique_test_data("api_cli_user1");
+    let (username2, email2) = unique_test_data("api_cli_user2");
+    let (name1, _) = unique_test_data("api_cli_product1");
+    let (name2, _) = unique_test_data("api_cli_product2");
+
+    println!("Generated usernames: {}, {}", username1, username2);
+
+    // Test 1: Create users via API interface and capture state
+    let (api_user_service, _api_product_service) = create_postgres_services(pool.clone());
+    
+    let create_user1 = CreateUser::new(username1.clone(), email1.clone()).unwrap();
+    let create_user2 = CreateUser::new(username2.clone(), email2.clone()).unwrap();
+
+    println!("Creating API user 1: {}", username1);
+    let _api_user1 = api_user_service.create(create_user1.clone()).await.unwrap();
+    println!("Creating API user 2: {}", username2);
+    let _api_user2 = api_user_service.create(create_user2.clone()).await.unwrap();
+    
+    let api_users_after_create = api_user_service.list().await.unwrap();
+    assert_eq!(api_users_after_create.len(), 2);
+
+    // Test 2: Create same users via CLI interface and compare
+    cleanup_test_data(&pool).await;
+    let (cli_user_service, _cli_product_service) = create_postgres_services(pool.clone());
+    
+    println!("Creating CLI user 1: {}", username1);
+    let _cli_user1 = cli_user_service.create(create_user1).await.unwrap();
+    println!("Creating CLI user 2: {}", username2);
+    let _cli_user2 = cli_user_service.create(create_user2).await.unwrap();
+    
+    let cli_users_after_create = cli_user_service.list().await.unwrap();
+    assert_eq!(cli_users_after_create.len(), 2);
+    
+    // Compare user data (ignoring IDs and timestamps)
+    compare_user_lists(&api_users_after_create, &cli_users_after_create);
+
+    // Test 3: Create products via API interface and capture state
+    cleanup_test_data(&pool).await;
+    let (_api_user_service, api_product_service) = create_postgres_services(pool.clone());
+    
+    let create_product1 = CreateProduct::new(name1.clone(), "Description 1".to_string()).unwrap();
+    let create_product2 = CreateProduct::new(name2.clone(), "Description 2".to_string()).unwrap();
+
+    let _api_product1 = api_product_service.create(create_product1.clone()).await.unwrap();
+    let _api_product2 = api_product_service.create(create_product2.clone()).await.unwrap();
+    
+    let api_products_after_create = api_product_service.list().await.unwrap();
+    assert_eq!(api_products_after_create.len(), 2);
+
+    // Test 4: Create same products via CLI interface and compare
+    cleanup_test_data(&pool).await;
+    let (_cli_user_service, cli_product_service) = create_postgres_services(pool.clone());
+    
+    let _cli_product1 = cli_product_service.create(create_product1).await.unwrap();
+    let _cli_product2 = cli_product_service.create(create_product2).await.unwrap();
+    
+    let cli_products_after_create = cli_product_service.list().await.unwrap();
+    assert_eq!(cli_products_after_create.len(), 2);
+    
+    // Compare product data (ignoring IDs and timestamps)
+    compare_product_lists(&api_products_after_create, &cli_products_after_create);
+
+    // Test 5: Test that both interfaces can access the same data (using shared database)
+    cleanup_test_data(&pool).await;
+    let (api_user_service, _api_product_service) = create_postgres_services(pool.clone());
+    let (cli_user_service, _cli_product_service) = create_postgres_services(pool);
+
+    // Create a user via API
+    let create_user = CreateUser::new(username1.clone(), email1.clone()).unwrap();
+    let api_user = api_user_service.create(create_user).await.unwrap();
+
+    // Both services should be able to access the same user
+    let api_retrieved_user = api_user_service.get(api_user.id()).await.unwrap();
+    let cli_retrieved_user = cli_user_service.get(api_user.id()).await.unwrap();
+    
+    assert_eq!(api_retrieved_user.username(), cli_retrieved_user.username());
+    assert_eq!(api_retrieved_user.email(), cli_retrieved_user.email());
+
+    // Test 6: Test update consistency - update same user via both interfaces
+    let update_user_data = UpdateUser::new(Some("updated_username".to_string()), Some("updated@example.com".to_string())).unwrap();
+    
+    let api_updated_user = api_user_service.update(api_user.id(), update_user_data.clone()).await.unwrap();
+    let cli_updated_user = cli_user_service.update(api_user.id(), update_user_data).await.unwrap();
+    
+    assert_eq!(api_updated_user.username(), cli_updated_user.username());
+    assert_eq!(api_updated_user.email(), cli_updated_user.email());
+
+    // Test 7: Test delete consistency
+    api_user_service.delete(api_user.id()).await.unwrap();
+    
+    // Both services should see the user as deleted
+    let api_users_after_delete = api_user_service.list().await.unwrap();
+    let cli_users_after_delete = cli_user_service.list().await.unwrap();
+    
+    assert_eq!(api_users_after_delete.len(), 0);
+    assert_eq!(cli_users_after_delete.len(), 0);
+}
+
+#[tokio::test]
+#[serial]
+async fn test_error_handling_consistency_across_interfaces() {
+    let pool = setup_test_db().await;
+    
+    // Create services for all interfaces using PostgreSQL backend
+    let (api_user_service, api_product_service) = create_postgres_services(pool.clone());
+    let (cli_user_service, cli_product_service) = create_postgres_services(pool.clone());
+    let (tui_user_service, tui_product_service) = create_postgres_services(pool);
+
+    // Test 1: Get non-existent user via all interfaces
+    let non_existent_id = Uuid::new_v4();
+    
+    let api_user_result = api_user_service.get(non_existent_id).await;
+    let cli_user_result = cli_user_service.get(non_existent_id).await;
+    let tui_user_result = tui_user_service.get(non_existent_id).await;
+    
+    assert!(api_user_result.is_err());
+    assert!(cli_user_result.is_err());
+    assert!(tui_user_result.is_err());
+    
+    // All should return the same error type
+    assert!(matches!(api_user_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+    assert!(matches!(cli_user_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+    assert!(matches!(tui_user_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+
+    // Test 2: Get non-existent product via all interfaces
+    let api_product_result = api_product_service.get(non_existent_id).await;
+    let cli_product_result = cli_product_service.get(non_existent_id).await;
+    let tui_product_result = tui_product_service.get(non_existent_id).await;
+    
+    assert!(api_product_result.is_err());
+    assert!(cli_product_result.is_err());
+    assert!(tui_product_result.is_err());
+    
+    assert!(matches!(api_product_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+    assert!(matches!(cli_product_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+    assert!(matches!(tui_product_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+
+    // Test 3: Update non-existent user via all interfaces
+    let update_user_data = UpdateUser::new(Some("new_username".to_string()), None).unwrap();
+    
+    let api_update_result = api_user_service.update(non_existent_id, update_user_data.clone()).await;
+    let cli_update_result = cli_user_service.update(non_existent_id, update_user_data.clone()).await;
+    let tui_update_result = tui_user_service.update(non_existent_id, update_user_data).await;
+    
+    assert!(api_update_result.is_err());
+    assert!(cli_update_result.is_err());
+    assert!(tui_update_result.is_err());
+    
+    assert!(matches!(api_update_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+    assert!(matches!(cli_update_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+    assert!(matches!(tui_update_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+
+    // Test 4: Delete non-existent user via all interfaces
+    let api_delete_result = api_user_service.delete(non_existent_id).await;
+    let cli_delete_result = cli_user_service.delete(non_existent_id).await;
+    let tui_delete_result = tui_user_service.delete(non_existent_id).await;
+    
+    assert!(api_delete_result.is_err());
+    assert!(cli_delete_result.is_err());
+    assert!(tui_delete_result.is_err());
+    
+    assert!(matches!(api_delete_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+    assert!(matches!(cli_delete_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+    assert!(matches!(tui_delete_result.unwrap_err(), application::ApplicationError::Domain(domain::DomainError::NotFound(_))));
+}
+
+#[tokio::test]
+#[serial]
+async fn test_validation_consistency_across_interfaces() {
+    // Test that all interfaces validate input consistently
+    // This test doesn't need actual services since validation happens at the domain level
+    
+    // Test 1: Create user with empty username
+    let create_user_empty_username = CreateUser::new("".to_string(), "test@example.com".to_string());
+    assert!(create_user_empty_username.is_err());
+    assert!(matches!(create_user_empty_username.unwrap_err(), domain::DomainError::InvalidInput(_)));
+
+    // Test 2: Create product with empty name
+    let create_product_empty_name = CreateProduct::new("".to_string(), "description".to_string());
+    assert!(create_product_empty_name.is_err());
+    assert!(matches!(create_product_empty_name.unwrap_err(), domain::DomainError::InvalidInput(_)));
+
+    // Test 3: Update user with empty username
+    let update_user_empty_username = UpdateUser::new(Some("".to_string()), None);
+    assert!(update_user_empty_username.is_err());
+    assert!(matches!(update_user_empty_username.unwrap_err(), domain::DomainError::InvalidInput(_)));
+
+    // Test 4: Update product with empty name
+    let update_product_empty_name = UpdateProduct::new(Some("".to_string()), None);
+    assert!(update_product_empty_name.is_err());
+    assert!(matches!(update_product_empty_name.unwrap_err(), domain::DomainError::InvalidInput(_)));
+} 

backend/crates/integration-tests/src/cross_repository_consistency_tests.rs

@@ -21,6 +21,9 @@ use serial_test::serial;
 
 // Helper functions for test setup
 async fn setup_test_db() -> PgPool {
+    // Explicitly set DATABASE_URL to use sharenet_test database
+    std::env::set_var("DATABASE_URL", "postgres://postgres:password@localhost:5432/sharenet_test");
+    
     let database_url = env::var("DATABASE_URL")
         .unwrap_or_else(|_| "postgres://postgres:password@localhost:5432/sharenet_test".to_string());
     let pool = PgPoolOptions::new()
@@ -38,14 +41,18 @@ async fn setup_test_db() -> PgPool {
 
 async fn cleanup_test_data(pool: &PgPool) {
     let mut tx = pool.begin().await.expect("Failed to begin transaction");
-    sqlx::query("DELETE FROM products").execute(&mut *tx).await.expect("Failed to delete products");
+    sqlx::query("TRUNCATE TABLE products, users RESTART IDENTITY CASCADE").execute(&mut *tx).await.expect("Failed to truncate tables");
-    sqlx::query("DELETE FROM users").execute(&mut *tx).await.expect("Failed to delete users");
     tx.commit().await.expect("Failed to commit cleanup transaction");
+    // Assert tables are empty
+    let users_count: (i64,) = sqlx::query_as("SELECT COUNT(*) FROM users").fetch_one(pool).await.expect("Failed to count users");
+    let products_count: (i64,) = sqlx::query_as("SELECT COUNT(*) FROM products").fetch_one(pool).await.expect("Failed to count products");
+    assert_eq!(users_count.0, 0, "Users table not empty after cleanup");
+    assert_eq!(products_count.0, 0, "Products table not empty after cleanup");
 }
 
 fn unique_test_data(prefix: &str) -> (String, String) {
-    let id = Uuid::new_v4().to_string()[..8].to_string();
+    let id = Uuid::new_v4().to_string();
-    (format!("{}_{}", prefix, id), format!("{}_test@example.com", prefix))
+    (format!("{}_{}", prefix, id), format!("{}_{}@example.com", prefix, id))
 }
 
 // Test data structures for comparison

backend/crates/integration-tests/src/lib.rs

@@ -16,6 +16,8 @@ pub mod cli_tests;
 #[cfg(test)]
 pub mod cross_repository_consistency_tests;
 #[cfg(test)]
+pub mod cross_interface_consistency_tests;
+#[cfg(test)]
 pub mod migration_tests;
 #[cfg(test)]
 pub mod performance_tests;