refactor: integration-tests and format whole project with cargo fmt

crates/backend/src/controller/class.rs

@@ -1,4 +1,4 @@
-use actix_web::{delete, get, post, put, Responder};
+use actix_web::{Responder, delete, get, post, put};
 
 pub fn setup(cfg: &mut actix_web::web::ServiceConfig) {
     cfg.service(get_classes)

crates/backend/src/controller/group.rs

@@ -1,4 +1,4 @@
-use actix_web::{delete, get, post, put, Responder};
+use actix_web::{Responder, delete, get, post, put};
 
 pub fn setup(cfg: &mut actix_web::web::ServiceConfig) {
     cfg.service(get_groups)

crates/backend/src/controller/project.rs

@@ -1,10 +1,10 @@
-use actix_web::{delete, get, post, put, web, Result};
+use actix_web::{Result, delete, get, post, put, web};
 use uuid::Uuid;
 use validator::Validate;
 
-use crate::db::project::CreateProject;
 use crate::db::Database;
 use crate::db::entity;
+use crate::db::project::CreateProject;
 use crate::error::ApiError;
 
 pub fn setup(cfg: &mut actix_web::web::ServiceConfig) {

crates/backend/src/controller/template.rs

@@ -1,4 +1,4 @@
-use actix_web::{delete, get, post, put, Responder};
+use actix_web::{Responder, delete, get, post, put};
 
 pub fn setup(cfg: &mut actix_web::web::ServiceConfig) {
     cfg.service(get_templates)

crates/backend/src/db/project.rs

@@ -6,9 +6,9 @@ use crate::db::entity::project;
 use sea_orm::ActiveValue::{NotSet, Set, Unchanged};
 use sea_orm::{ActiveModelTrait, DeleteResult, EntityTrait};
 use serde::Deserialize;
+use utoipa::ToSchema;
 use uuid::Uuid;
 use validator::Validate;
-use utoipa::ToSchema;
 
 #[derive(Deserialize, Validate, ToSchema)]
 pub struct CreateProject {

crates/backend/src/error.rs

@@ -66,4 +66,3 @@ impl MessageResponse {
         }
     }
 }
-

crates/backend/src/lib.rs

@@ -1,8 +1,8 @@
 pub mod controller;
 pub mod db;
 pub mod error;
-pub mod utoipa;
 pub mod utils;
+pub mod utoipa;
 
 pub use db::Database;
 pub use db::entity;

crates/backend/src/main.rs

@@ -7,8 +7,8 @@ use utoipa_swagger_ui::SwaggerUi;
 mod controller;
 mod db;
 mod error;
-mod utoipa;
 mod utils;
+mod utoipa;
 
 use db::Database;
 use log::info;
@@ -61,10 +61,10 @@ async fn main() -> std::io::Result<()> {
             .wrap(Logger::default())
             .wrap(session_middleware)
             .service(web::scope("/api/v1").configure(controller::register_controllers))
-            .service(
-                SwaggerUi::new("/swagger-ui/{_:.*}")
-                    .url("/api-docs/openapi.json", crate::utoipa::ApiDoc::openapi_spec()),
-            );
+            .service(SwaggerUi::new("/swagger-ui/{_:.*}").url(
+                "/api-docs/openapi.json",
+                crate::utoipa::ApiDoc::openapi_spec(),
+            ));
 
         #[cfg(feature = "serve")]
         let app = {
@@ -81,7 +81,6 @@ async fn main() -> std::io::Result<()> {
     .await
 }
 
-
 pub async fn connect_to_redis_database() -> RedisSessionStore {
     let redis_host = get_env_var("REDIS_HOST").expect("REDIS_HOST must be set in .env");
     let redis_port = get_env_var("REDIS_PORT")

crates/backend/tests/common/db_helpers/auth_helpers.rs

@@ -0,0 +1,121 @@
+use crate::common::test_helpers::TestContext;
+use backend::{Database, db::entity};
+use uuid::Uuid;
+
+impl TestContext {
+    pub async fn create_user_with_auth(
+        &self,
+        db: &Database,
+        username: Option<String>,
+        name: Option<String>,
+        password: String,
+    ) -> Result<entity::user::Model, backend::error::ApiError> {
+        self.create_user_with_password(db, username, name, password)
+            .await
+    }
+
+    pub async fn verify_user_login(
+        &self,
+        db: &Database,
+        username: &str,
+        password: &str,
+    ) -> Result<Uuid, backend::error::ApiError> {
+        db.verify_local_user(username, password).await
+    }
+
+    pub async fn create_authenticated_user(
+        &self,
+        db: &Database,
+        username: Option<String>,
+        password: Option<String>,
+    ) -> Result<(entity::user::Model, String), backend::error::ApiError> {
+        let test_id = &self.test_id;
+        let username = username.unwrap_or_else(|| format!("auth_user_{}", test_id));
+        let password = password.unwrap_or_else(|| "test_password_123".to_string());
+
+        let user = self
+            .create_user_with_password(db, Some(username.clone()), None, password.clone())
+            .await?;
+
+        Ok((user, password))
+    }
+
+    pub async fn create_multiple_authenticated_users(
+        &self,
+        db: &Database,
+        count: usize,
+    ) -> Result<Vec<(entity::user::Model, String)>, backend::error::ApiError> {
+        let mut users = Vec::new();
+
+        for i in 0..count {
+            let username = format!("auth_user_{}_{}", self.test_id, i);
+            let password = format!("password_{}", i);
+            let user_data = self
+                .create_authenticated_user(db, Some(username), Some(password.clone()))
+                .await?;
+            users.push(user_data);
+        }
+
+        Ok(users)
+    }
+
+    pub async fn assert_user_can_login(
+        &self,
+        db: &Database,
+        username: &str,
+        password: &str,
+    ) -> bool {
+        match self.verify_user_login(db, username, password).await {
+            Ok(_) => true,
+            Err(_) => false,
+        }
+    }
+
+    pub async fn assert_user_cannot_login(
+        &self,
+        db: &Database,
+        username: &str,
+        password: &str,
+    ) -> bool {
+        !self.assert_user_can_login(db, username, password).await
+    }
+
+    pub async fn assert_user_login_returns_correct_id(
+        &self,
+        db: &Database,
+        username: &str,
+        password: &str,
+        expected_id: Uuid,
+    ) -> bool {
+        match self.verify_user_login(db, username, password).await {
+            Ok(id) => id == expected_id,
+            Err(_) => false,
+        }
+    }
+
+    pub async fn test_invalid_login_attempts(&self, db: &Database, username: &str) -> Vec<bool> {
+        let invalid_passwords = vec!["wrong_password", "", "123", "password"];
+        let mut results = Vec::new();
+
+        for password in invalid_passwords {
+            let can_login = self.assert_user_can_login(db, username, password).await;
+            results.push(!can_login); // We expect these to fail, so invert the result
+        }
+
+        results
+    }
+
+    pub async fn create_user_and_verify_auth(
+        &self,
+        db: &Database,
+        username: Option<String>,
+        password: Option<String>,
+    ) -> Result<(entity::user::Model, bool), backend::error::ApiError> {
+        let (user, pwd) = self
+            .create_authenticated_user(db, username, password)
+            .await?;
+        let can_login = self.assert_user_can_login(db, &user.username, &pwd).await;
+
+        Ok((user, can_login))
+    }
+}

crates/backend/tests/common/db_helpers/mod.rs

@@ -0,0 +1,3 @@
+pub mod auth_helpers;
+pub mod project_helpers;
+pub mod user_helpers;

crates/backend/tests/common/db_helpers/project_helpers.rs

@@ -0,0 +1,125 @@
+use crate::common::test_helpers::TestContext;
+use backend::{
+    Database,
+    db::{entity, project::CreateProject},
+};
+use uuid::Uuid;
+
+impl TestContext {
+    pub async fn create_project(
+        &self,
+        db: &Database,
+        name: Option<String>,
+    ) -> Result<entity::project::Model, backend::error::ApiError> {
+        let name = name.unwrap_or_else(|| format!("Test Project {}", self.test_id));
+        let create_project = CreateProject { name };
+
+        let project = db.create_project(create_project).await?;
+
+        if let Ok(mut projects) = self.created_projects.lock() {
+            projects.push(project.id);
+        }
+
+        Ok(project)
+    }
+
+    pub async fn create_project_with_name(
+        &self,
+        db: &Database,
+        name: String,
+    ) -> Result<entity::project::Model, backend::error::ApiError> {
+        self.create_project(db, Some(name)).await
+    }
+
+    pub async fn create_multiple_projects(
+        &self,
+        db: &Database,
+        count: usize,
+    ) -> Result<Vec<entity::project::Model>, backend::error::ApiError> {
+        let mut projects = Vec::new();
+
+        for i in 0..count {
+            let name = format!("Test Project {} {}", self.test_id, i);
+            let project = self.create_project(db, Some(name)).await?;
+            projects.push(project);
+        }
+
+        Ok(projects)
+    }
+
+    pub async fn get_project_by_id(
+        &self,
+        db: &Database,
+        id: &Uuid,
+    ) -> Result<Option<entity::project::Model>, backend::error::ApiError> {
+        db.get_project(id).await
+    }
+
+    pub async fn get_all_projects(
+        &self,
+        db: &Database,
+    ) -> Result<Vec<entity::project::Model>, backend::error::ApiError> {
+        db.get_projects().await
+    }
+
+    pub async fn update_project(
+        &self,
+        db: &Database,
+        id: &Uuid,
+        name: String,
+    ) -> Result<entity::project::Model, backend::error::ApiError> {
+        let update_data = CreateProject { name };
+        db.update_project(id, update_data).await
+    }
+
+    pub async fn assert_project_exists(&self, db: &Database, id: &Uuid) -> bool {
+        match self.get_project_by_id(db, id).await {
+            Ok(Some(_)) => true,
+            _ => false,
+        }
+    }
+
+    pub async fn assert_project_count(&self, db: &Database, expected: usize) -> bool {
+        match self.get_all_projects(db).await {
+            Ok(projects) => projects.len() == expected,
+            Err(_) => false,
+        }
+    }
+
+    pub async fn assert_project_not_exists(&self, db: &Database, id: &Uuid) -> bool {
+        !self.assert_project_exists(db, id).await
+    }
+
+    pub async fn assert_project_name(&self, db: &Database, id: &Uuid, expected_name: &str) -> bool {
+        match self.get_project_by_id(db, id).await {
+            Ok(Some(project)) => project.name == expected_name,
+            _ => false,
+        }
+    }
+
+    pub async fn delete_project(
+        &self,
+        db: &Database,
+        id: &Uuid,
+    ) -> Result<(), backend::error::ApiError> {
+        db.delete_project(id).await?;
+
+        if let Ok(mut projects) = self.created_projects.lock() {
+            projects.retain(|&project_id| project_id != *id);
+        }
+
+        Ok(())
+    }
+
+    pub async fn cleanup_projects(&self, db: &Database) {
+        if let Ok(projects) = self.created_projects.lock() {
+            for project_id in projects.iter() {
+                let _ = db.delete_project(project_id).await;
+            }
+        }
+
+        if let Ok(mut projects) = self.created_projects.lock() {
+            projects.clear();
+        }
+    }
+}

crates/backend/tests/common/db_helpers/user_helpers.rs

@@ -0,0 +1,121 @@
+use crate::common::test_helpers::TestContext;
+use backend::{Database, db::entity};
+use uuid::Uuid;
+
+impl TestContext {
+    pub async fn create_user(
+        &self,
+        db: &Database,
+        username: Option<String>,
+        name: Option<String>,
+    ) -> Result<entity::user::Model, backend::error::ApiError> {
+        let test_id = &self.test_id;
+        let username = username.unwrap_or_else(|| format!("user_{}", test_id));
+        let name = name.unwrap_or_else(|| format!("Test User {}", test_id));
+        let password = "password123".to_string();
+
+        let user = db.create_user(name, username, password).await?;
+
+        if let Ok(mut users) = self.created_users.lock() {
+            users.push(user.id);
+        }
+
+        Ok(user)
+    }
+
+    pub async fn create_user_with_password(
+        &self,
+        db: &Database,
+        username: Option<String>,
+        name: Option<String>,
+        password: String,
+    ) -> Result<entity::user::Model, backend::error::ApiError> {
+        let test_id = &self.test_id;
+        let username = username.unwrap_or_else(|| format!("user_{}", test_id));
+        let name = name.unwrap_or_else(|| format!("Test User {}", test_id));
+
+        let user = db.create_user(name, username, password).await?;
+
+        if let Ok(mut users) = self.created_users.lock() {
+            users.push(user.id);
+        }
+
+        Ok(user)
+    }
+
+    pub async fn create_multiple_users(
+        &self,
+        db: &Database,
+        count: usize,
+    ) -> Result<Vec<entity::user::Model>, backend::error::ApiError> {
+        let mut users = Vec::new();
+
+        for i in 0..count {
+            let username = format!("user_{}_{}", self.test_id, i);
+            let name = format!("Test User {} {}", self.test_id, i);
+            let user = self.create_user(db, Some(username), Some(name)).await?;
+            users.push(user);
+        }
+
+        Ok(users)
+    }
+
+    pub async fn get_user_by_id(
+        &self,
+        db: &Database,
+        id: Uuid,
+    ) -> Result<Option<entity::user::Model>, backend::error::ApiError> {
+        db.get_user(id).await
+    }
+
+    pub async fn get_all_users(
+        &self,
+        db: &Database,
+    ) -> Result<Vec<entity::user::Model>, backend::error::ApiError> {
+        db.get_users().await
+    }
+
+    pub async fn assert_user_exists(&self, db: &Database, id: Uuid) -> bool {
+        match self.get_user_by_id(db, id).await {
+            Ok(Some(_)) => true,
+            _ => false,
+        }
+    }
+
+    pub async fn assert_user_count(&self, db: &Database, expected: usize) -> bool {
+        match self.get_all_users(db).await {
+            Ok(users) => users.len() == expected,
+            Err(_) => false,
+        }
+    }
+
+    pub async fn assert_user_not_exists(&self, db: &Database, id: Uuid) -> bool {
+        !self.assert_user_exists(db, id).await
+    }
+
+    pub async fn delete_user(
+        &self,
+        db: &Database,
+        id: Uuid,
+    ) -> Result<(), backend::error::ApiError> {
+        db.delete_user(id).await?;
+
+        if let Ok(mut users) = self.created_users.lock() {
+            users.retain(|&user_id| user_id != id);
+        }
+
+        Ok(())
+    }
+
+    pub async fn cleanup_users(&self, db: &Database) {
+        if let Ok(users) = self.created_users.lock() {
+            for user_id in users.iter() {
+                let _ = db.delete_user(*user_id).await;
+            }
+        }
+
+        if let Ok(mut users) = self.created_users.lock() {
+            users.clear();
+        }
+    }
+}

crates/backend/tests/common/mod.rs

@@ -1,76 +1,5 @@
-use backend::{Database, build_database_url};
-use log::{debug, info};
-use migration::{Migrator, MigratorTrait};
-use testcontainers::{ContainerAsync, ImageExt, runners::AsyncRunner};
-use testcontainers_modules::{postgres::Postgres, redis::Redis};
-
+pub mod db_helpers;
+pub mod setup;
 pub mod test_helpers;
 
-pub async fn setup() -> (ContainerAsync<Postgres>, ContainerAsync<Redis>, Database) {
-    let postgres = Postgres::default()
-        .with_env_var("POSTGRES_DB", "test_db")
-        .with_env_var("POSTGRES_USER", "postgres")
-        .with_env_var("POSTGRES_PASSWORD", "postgres")
-        .start()
-        .await
-        .expect("Failed to start PostgreSQL container");
-
-    let redis = Redis::default()
-        .start()
-        .await
-        .expect("Failed to start Redis container");
-
-    let postgres_port = postgres.get_host_port_ipv4(5432).await.unwrap();
-    let redis_port = redis.get_host_port_ipv4(6379).await.unwrap();
-
-    debug!("PostgreSQL container started on port: {}", postgres_port);
-    debug!("Redis container started on port: {}", redis_port);
-
-    // Wait for PostgreSQL to be ready
-    wait_for_postgres_ready(&postgres).await;
-
-    unsafe {
-        std::env::set_var("DB_HOST", "127.0.0.1");
-        std::env::set_var("DB_PORT", postgres_port.to_string());
-        std::env::set_var("DB_NAME", "test_db");
-        std::env::set_var("DB_USER", "postgres");
-        std::env::set_var("DB_PASSWORD", "postgres");
-        std::env::set_var("REDIS_HOST", "127.0.0.1");
-        std::env::set_var("REDIS_PORT", redis_port.to_string());
-    }
-
-    let database_url = build_database_url();
-    info!("Database URL: {}", database_url);
-
-    let database = Database::new(database_url.into()).await.unwrap();
-
-    Migrator::up(database.connection(), None).await.unwrap();
-
-    (postgres, redis, database)
-}
-
-async fn wait_for_postgres_ready(container: &ContainerAsync<Postgres>) {
-    info!("Waiting for PostgreSQL to be ready...");
-
-    for attempt in 1..=30 {
-        match container.stdout_to_vec().await {
-            Ok(logs) => {
-                let log_string = String::from_utf8_lossy(&logs);
-
-                if log_string.contains("database system is ready to accept connections") {
-                    info!("PostgreSQL is ready after {} attempts", attempt);
-                    return;
-                }
-
-                debug!("Attempt {}: PostgreSQL not ready yet", attempt);
-            }
-            Err(e) => {
-                debug!("Attempt {}: Failed to read logs: {}", attempt, e);
-            }
-        }
-
-        tokio::time::sleep(tokio::time::Duration::from_secs(1)).await;
-    }
-
-    panic!("PostgreSQL failed to become ready within 30 seconds");
-}
+pub use setup::setup;

crates/backend/tests/common/setup.rs

@@ -0,0 +1,74 @@
+use backend::{Database, build_database_url};
+use log::{debug, info};
+use migration::{Migrator, MigratorTrait};
+use testcontainers::{ContainerAsync, ImageExt, runners::AsyncRunner};
+use testcontainers_modules::{postgres::Postgres, redis::Redis};
+
+pub async fn setup() -> (ContainerAsync<Postgres>, ContainerAsync<Redis>, Database) {
+    let postgres = Postgres::default()
+        .with_env_var("POSTGRES_DB", "test_db")
+        .with_env_var("POSTGRES_USER", "postgres")
+        .with_env_var("POSTGRES_PASSWORD", "postgres")
+        .start()
+        .await
+        .expect("Failed to start PostgreSQL container");
+
+    let redis = Redis::default()
+        .start()
+        .await
+        .expect("Failed to start Redis container");
+
+    let postgres_port = postgres.get_host_port_ipv4(5432).await.unwrap();
+    let redis_port = redis.get_host_port_ipv4(6379).await.unwrap();
+
+    debug!("PostgreSQL container started on port: {}", postgres_port);
+    debug!("Redis container started on port: {}", redis_port);
+
+    // Wait for PostgreSQL to be ready
+    wait_for_postgres_ready(&postgres).await;
+
+    unsafe {
+        std::env::set_var("DB_HOST", "127.0.0.1");
+        std::env::set_var("DB_PORT", postgres_port.to_string());
+        std::env::set_var("DB_NAME", "test_db");
+        std::env::set_var("DB_USER", "postgres");
+        std::env::set_var("DB_PASSWORD", "postgres");
+        std::env::set_var("REDIS_HOST", "127.0.0.1");
+        std::env::set_var("REDIS_PORT", redis_port.to_string());
+    }
+
+    let database_url = build_database_url();
+    info!("Database URL: {}", database_url);
+
+    let database = Database::new(database_url.into()).await.unwrap();
+
+    Migrator::up(database.connection(), None).await.unwrap();
+
+    (postgres, redis, database)
+}
+
+async fn wait_for_postgres_ready(container: &ContainerAsync<Postgres>) {
+    info!("Waiting for PostgreSQL to be ready...");
+
+    for attempt in 1..=30 {
+        match container.stdout_to_vec().await {
+            Ok(logs) => {
+                let log_string = String::from_utf8_lossy(&logs);
+
+                if log_string.contains("database system is ready to accept connections") {
+                    info!("PostgreSQL is ready after {} attempts", attempt);
+                    return;
+                }
+
+                debug!("Attempt {}: PostgreSQL not ready yet", attempt);
+            }
+            Err(e) => {
+                debug!("Attempt {}: Failed to read logs: {}", attempt, e);
+            }
+        }
+
+        tokio::time::sleep(tokio::time::Duration::from_secs(1)).await;
+    }
+
+    panic!("PostgreSQL failed to become ready within 30 seconds");
+}

crates/backend/tests/common/test_helpers.rs

@@ -3,6 +3,7 @@ use lazy_static::lazy_static;
 use std::sync::atomic::{AtomicU64, Ordering};
 use testcontainers::ContainerAsync;
 use testcontainers_modules::{postgres::Postgres, redis::Redis};
+use uuid::Uuid;
 
 use super::setup;
 
@@ -61,22 +62,35 @@ impl UserFactory {
 
 pub struct TestContext {
     pub test_id: String,
+    pub created_users: std::sync::Arc<std::sync::Mutex<Vec<uuid::Uuid>>>,
+    pub created_projects: std::sync::Arc<std::sync::Mutex<Vec<uuid::Uuid>>>,
 }
 
 impl TestContext {
     pub fn new() -> Self {
         Self {
             test_id: get_unique_test_id(),
+            created_users: std::sync::Arc::new(std::sync::Mutex::new(Vec::new())),
+            created_projects: std::sync::Arc::new(std::sync::Mutex::new(Vec::new())),
         }
     }
 
-    pub fn create_user_data(&self, username_prefix: Option<&str>, name: Option<&str>) -> serde_json::Value {
+    pub fn create_user_data(
+        &self,
+        username_prefix: Option<&str>,
+        name: Option<&str>,
+    ) -> serde_json::Value {
         let username = username_prefix
             .map(|prefix| format!("{}_{}", prefix, self.test_id))
             .unwrap_or_else(|| format!("user_{}", self.test_id));
 
         UserFactory::create_request(Some(username), name.map(String::from))
     }
+
+    pub async fn cleanup_all(&self, db: &Database) {
+        self.cleanup_projects(db).await;
+        self.cleanup_users(db).await;
+    }
 }
 
 #[macro_export]
@@ -95,3 +109,17 @@ macro_rules! create_test_app {
         .await
     }};
 }
+
+#[macro_export]
+macro_rules! with_test_context {
+    ($test_fn:expr) => {{
+        let ctx = $crate::common::test_helpers::TestContext::new();
+        let db = $crate::common::test_helpers::get_database().await;
+
+        let result = $test_fn(ctx.clone(), db).await;
+
+        ctx.cleanup_all(db).await;
+
+        result
+    }};
+}

crates/backend/tests/endpoints/user.rs

@@ -1,7 +1,7 @@
 use actix_web::{http::header, test};
 use serde::{Deserialize, Serialize};
 
-use crate::{create_test_app, common::test_helpers::UserFactory};
+use crate::{common::test_helpers::UserFactory, create_test_app};
 
 #[cfg(test)]
 mod tests {
@@ -58,7 +58,11 @@ mod tests {
             .await;
 
         let create_status = create_resp.status();
-        assert!(create_status.is_success(), "Failed to create user: {}", create_status);
+        assert!(
+            create_status.is_success(),
+            "Failed to create user: {}",
+            create_status
+        );
         let user: RespCreateUser = test::read_body_json(create_resp).await;
 
         // Delete the user
@@ -70,7 +74,11 @@ mod tests {
 
         let delete_message: String = test::read_body_json(delete_resp).await;
         assert_eq!(delete_message, format!("User {} deleted", user.id));
-        assert!(delete_status.is_success(), "Failed to delete user with status: {:?}", delete_status);
+        assert!(
+            delete_status.is_success(),
+            "Failed to delete user with status: {:?}",
+            delete_status
+        );
     }
 
     #[actix_web::test]

crates/backend/tests/example_refactored_test.rs

@@ -0,0 +1,164 @@
+use crate::{common::test_helpers::TestContext, create_test_app, with_test_context};
+use actix_web::test;
+use backend::Database;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[actix_web::test]
+    async fn test_user_crud_operations() {
+        with_test_context!(|ctx: TestContext, db: &Database| async move {
+            // Create single user
+            let user = ctx
+                .create_user(
+                    db,
+                    Some("testuser".to_string()),
+                    Some("Test User".to_string()),
+                )
+                .await
+                .unwrap();
+            assert_eq!(user.username, "testuser");
+            assert_eq!(user.name, "Test User");
+
+            // Assert user exists
+            assert!(ctx.assert_user_exists(db, user.id).await);
+
+            // Get user by ID
+            let retrieved_user = ctx.get_user_by_id(db, user.id).await.unwrap().unwrap();
+            assert_eq!(retrieved_user.id, user.id);
+
+            // Create multiple users
+            let users = ctx.create_multiple_users(db, 3).await.unwrap();
+            assert_eq!(users.len(), 3);
+
+            // Assert user count (initial user + 3 new users = 4)
+            assert!(ctx.assert_user_count(db, 4).await);
+
+            // Delete a user
+            ctx.delete_user(db, user.id).await.unwrap();
+            assert!(ctx.assert_user_not_exists(db, user.id).await);
+
+            // All cleanup handled automatically
+        });
+    }
+
+    #[actix_web::test]
+    async fn test_project_crud_operations() {
+        with_test_context!(|ctx: TestContext, db: &Database| async move {
+            // Create project with custom name
+            let project = ctx
+                .create_project_with_name(db, "My Test Project".to_string())
+                .await
+                .unwrap();
+            assert_eq!(project.name, "My Test Project");
+
+            // Assert project exists
+            assert!(ctx.assert_project_exists(db, &project.id).await);
+
+            // Update project
+            let updated = ctx
+                .update_project(db, &project.id, "Updated Project Name".to_string())
+                .await
+                .unwrap();
+            assert_eq!(updated.name, "Updated Project Name");
+
+            // Assert project name changed
+            assert!(
+                ctx.assert_project_name(db, &project.id, "Updated Project Name")
+                    .await
+            );
+
+            // Create multiple projects
+            let projects = ctx.create_multiple_projects(db, 2).await.unwrap();
+            assert_eq!(projects.len(), 2);
+
+            // Assert project count (1 original + 2 new = 3)
+            assert!(ctx.assert_project_count(db, 3).await);
+
+            // All cleanup automatic
+        });
+    }
+
+    #[actix_web::test]
+    async fn test_authentication_operations() {
+        with_test_context!(|ctx: TestContext, db: &Database| async move {
+            // Create authenticated user
+            let (user, password) = ctx
+                .create_authenticated_user(
+                    db,
+                    Some("authuser".to_string()),
+                    Some("securepass123".to_string()),
+                )
+                .await
+                .unwrap();
+
+            // Test successful login
+            assert!(
+                ctx.assert_user_can_login(db, "authuser", "securepass123")
+                    .await
+            );
+
+            // Test login returns correct user ID
+            assert!(
+                ctx.assert_user_login_returns_correct_id(db, "authuser", "securepass123", user.id)
+                    .await
+            );
+
+            // Test failed login with wrong password
+            assert!(
+                ctx.assert_user_cannot_login(db, "authuser", "wrongpassword")
+                    .await
+            );
+
+            // Test multiple invalid login attempts
+            let invalid_results = ctx.test_invalid_login_attempts(db, "authuser").await;
+            assert!(invalid_results.iter().all(|&result| result)); // All should fail (return true)
+
+            // Create and verify multiple auth users
+            let auth_users = ctx
+                .create_multiple_authenticated_users(db, 2)
+                .await
+                .unwrap();
+            assert_eq!(auth_users.len(), 2);
+
+            for (user, pwd) in &auth_users {
+                assert!(ctx.assert_user_can_login(db, &user.username, pwd).await);
+            }
+
+            // All cleanup automatic
+        });
+    }
+
+    #[actix_web::test]
+    async fn test_mixed_operations_with_api() {
+        with_test_context!(|ctx: TestContext, db: &Database| async move {
+            let app = create_test_app!();
+
+            // Create user via helper
+            let user = ctx.create_user(db, None, None).await.unwrap();
+
+            // Create project via helper
+            let project = ctx.create_project(db, None).await.unwrap();
+
+            // Test API endpoints
+            let user_resp = test::TestRequest::get()
+                .uri(&format!("/api/v1/user/{}", user.id))
+                .send_request(&app)
+                .await;
+            assert!(user_resp.status().is_success());
+
+            let projects_resp = test::TestRequest::get()
+                .uri("/api/v1/project")
+                .send_request(&app)
+                .await;
+            assert!(projects_resp.status().is_success());
+
+            // Assert both exist in database
+            assert!(ctx.assert_user_exists(db, user.id).await);
+            assert!(ctx.assert_project_exists(db, &project.id).await);
+
+            // All cleanup automatic
+        });
+    }
+}