Add unit tests for the services

Cargo.lock

@@ -36,6 +36,12 @@ version = "0.2.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5c6cb57a04249c6480766f7f7cef5467412af1490f8d1e243141daddada3264f"
 
+[[package]]
+name = "anstyle"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8901269c6307e8d93993578286ac0edf7f195079ffff5ebdeea6a59ffb7e36bc"
+
 [[package]]
 name = "app"
 version = "0.1.0"
@@ -262,6 +268,8 @@ dependencies = [
 name = "dao"
 version = "0.1.0"
 dependencies = [
+ "async-trait",
+ "mockall",
  "thiserror",
  "uuid",
 ]
@@ -270,6 +278,7 @@ dependencies = [
 name = "dao_impl"
 version = "0.1.0"
 dependencies = [
+ "async-trait",
  "dao",
  "sqlx",
 ]
@@ -303,6 +312,12 @@ version = "0.15.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
 
+[[package]]
+name = "downcast"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1435fa1053d8b2fbbe9be7e97eca7f33d37b28409959813daefc1446a14247f1"
+
 [[package]]
 name = "either"
 version = "1.11.0"
@@ -383,6 +398,12 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "fragile"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c2141d6d6c8512188a7891b4b01590a45f6dac67afb4f255c4124dbb86d4eaa"
+
 [[package]]
 name = "futures-channel"
 version = "0.3.30"
@@ -773,6 +794,33 @@ dependencies = [
  "windows-sys 0.48.0",
 ]
 
+[[package]]
+name = "mockall"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43766c2b5203b10de348ffe19f7e54564b64f3d6018ff7648d1e2d6d3a0f0a48"
+dependencies = [
+ "cfg-if",
+ "downcast",
+ "fragile",
+ "lazy_static",
+ "mockall_derive",
+ "predicates",
+ "predicates-tree",
+]
+
+[[package]]
+name = "mockall_derive"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af7cbce79ec385a1d4f54baa90a76401eb15d9cab93685f62e7e9f942aa00ae2"
+dependencies = [
+ "cfg-if",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.60",
+]
+
 [[package]]
 name = "nom"
 version = "7.1.3"
@@ -964,6 +1012,32 @@ version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
 
+[[package]]
+name = "predicates"
+version = "3.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68b87bfd4605926cdfefc1c3b5f8fe560e3feca9d5552cf68c466d3d8236c7e8"
+dependencies = [
+ "anstyle",
+ "predicates-core",
+]
+
+[[package]]
+name = "predicates-core"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b794032607612e7abeb4db69adb4e33590fa6cf1149e95fd7cb00e634b92f174"
+
+[[package]]
+name = "predicates-tree"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "368ba315fb8c5052ab692e68a0eefec6ec57b23a36959c14496f0b0df2c0cecf"
+dependencies = [
+ "predicates-core",
+ "termtree",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.81"
@@ -1157,16 +1231,22 @@ dependencies = [
 name = "service"
 version = "0.1.0"
 dependencies = [
+ "async-trait",
  "dao",
+ "mockall",
  "thiserror",
+ "tokio",
 ]
 
 [[package]]
 name = "service_impl"
 version = "0.1.0"
 dependencies = [
+ "async-trait",
  "dao",
+ "mockall",
  "service",
+ "tokio",
 ]
 
 [[package]]
@@ -1527,6 +1607,12 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "termtree"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3369f5ac52d5eb6ab48c6b4ffdc8efbcad6b89c765749064ba298f2c68a16a76"
+
 [[package]]
 name = "thiserror"
 version = "1.0.59"

dao/Cargo.toml

@@ -6,5 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+async-trait = "0.1.80"
+mockall = "0.12.1"
 thiserror = "1.0.59"
 uuid = "1.8"

dao/src/lib.rs

@@ -1,5 +1,7 @@
-use std::{future::Future, sync::Arc};
+use std::sync::Arc;
 
+use async_trait::async_trait;
+use mockall::automock;
 use thiserror::Error;
 
 #[derive(Error, Debug)]
@@ -8,14 +10,14 @@ pub enum DaoError {
     DatabaseQueryError(#[from] Box<dyn std::error::Error>),
 }
 
+#[automock]
+#[async_trait]
 pub trait HelloDao {
-    fn get_hello(&self) -> impl Future<Output = Result<Arc<str>, DaoError>> + Send;
+    async fn get_hello(&self) -> Result<Arc<str>, DaoError>;
 }
 
+#[automock]
+#[async_trait]
 pub trait PermissionDao {
-    fn has_privilege(
-        &self,
-        user: &str,
-        privilege: &str,
-    ) -> impl Future<Output = Result<bool, DaoError>> + Send;
+    async fn has_privilege(&self, user: &str, privilege: &str) -> Result<bool, DaoError>;
 }

dao_impl/Cargo.toml

@@ -3,6 +3,9 @@ name = "dao_impl"
 version = "0.1.0"
 edition = "2021"
 
+[dependencies]
+async-trait = "0.1.80"
+
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies.sqlx]

dao_impl/src/lib.rs

@@ -1,5 +1,6 @@
 use std::sync::Arc;
 
+use async_trait::async_trait;
 use dao::DaoError;
 use sqlx::{query, SqlitePool};
 
@@ -13,6 +14,7 @@ impl HelloDaoImpl {
     }
 }
 
+#[async_trait]
 impl dao::HelloDao for HelloDaoImpl {
     async fn get_hello(&self) -> Result<Arc<str>, dao::DaoError> {
         let result = query!(r"SELECT 'Hello, world!' as message")
@@ -32,6 +34,7 @@ impl PermissionDaoImpl {
         Self { pool }
     }
 }
+#[async_trait]
 impl dao::PermissionDao for PermissionDaoImpl {
     async fn has_privilege(&self, user: &str, privilege: &str) -> Result<bool, dao::DaoError> {
         let result = query!(

service/Cargo.toml

@@ -3,6 +3,10 @@ name = "service"
 version = "0.1.0"
 edition = "2021"
 
+[dependencies]
+async-trait = "0.1.80"
+mockall = "0.12.1"
+
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies.thiserror]
@@ -10,3 +14,6 @@ version = "1.0"
 
 [dependencies.dao]
 path = "../dao"
+
+[dev-dependencies.tokio]
+version = "1.37.0"

service/src/lib.rs

@@ -1,3 +1,5 @@
+use async_trait::async_trait;
+use mockall::automock;
 use std::{future::Future, sync::Arc};
 use thiserror::Error;
 
@@ -10,17 +12,19 @@ pub enum ServiceError {
     Forbidden,
 }
 
+#[automock]
 pub trait HelloService {
     fn hello(&self) -> impl Future<Output = Result<Arc<str>, ServiceError>> + Send;
 }
 
+#[automock]
+#[async_trait]
 pub trait PermissionService {
-    fn check_permission(
-        &self,
-        privilege: &str,
-    ) -> impl Future<Output = Result<(), ServiceError>> + Send;
+    async fn check_permission(&self, privilege: &str) -> Result<(), ServiceError>;
 }
 
+#[automock]
+#[async_trait]
 pub trait UserService {
-    fn current_user(&self) -> impl Future<Output = Result<Arc<str>, ServiceError>> + Send;
+    async fn current_user(&self) -> Result<Arc<str>, ServiceError>;
 }

service_impl/Cargo.toml

@@ -3,6 +3,10 @@ name = "service_impl"
 version = "0.1.0"
 edition = "2021"
 
+[dependencies]
+async-trait = "0.1.80"
+mockall = "0.12.1"
+
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies.service]
@@ -10,3 +14,7 @@ path = "../service"
 
 [dependencies.dao]
 path = "../dao"
+
+[dev-dependencies.tokio]
+version = "1.37.0"
+features = ["full"]

service_impl/src/lib.rs

@@ -1,5 +1,7 @@
 use std::sync::Arc;
 
+use async_trait::async_trait;
+
 pub struct HelloServiceImpl<HelloDao, PermissionService>
 where
     HelloDao: dao::HelloDao + Sync + Send,
@@ -54,6 +56,7 @@ where
     }
 }
 
+#[async_trait]
 impl<PermissionDao, UserService> service::PermissionService
     for PermissionServiceImpl<PermissionDao, UserService>
 where
@@ -76,8 +79,109 @@ where
 
 pub struct UserServiceDev;
 
+#[async_trait]
 impl service::UserService for UserServiceDev {
     async fn current_user(&self) -> Result<Arc<str>, service::ServiceError> {
         Ok("DEVUSER".into())
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use mockall::predicate::eq;
+    use service::{HelloService, MockPermissionService, PermissionService};
+    use tokio;
+
+    #[tokio::test]
+    async fn test_get_hello_successful() {
+        let mut hello_dao = dao::MockHelloDao::new();
+        hello_dao
+            .expect_get_hello()
+            .times(1)
+            .returning(|| Ok("Hello, world!".into()));
+        let mut permission_service = MockPermissionService::new();
+        permission_service
+            .expect_check_permission()
+            .times(1)
+            .returning(|_| Ok(()));
+
+        let hello_service =
+            HelloServiceImpl::new(Arc::new(hello_dao), Arc::new(permission_service));
+        assert_eq!(
+            "Hello, world!",
+            hello_service.hello().await.unwrap().as_ref()
+        );
+    }
+
+    #[tokio::test]
+    async fn test_get_hello_no_permission() {
+        let hello_dao = dao::MockHelloDao::new();
+
+        let mut permission_service = MockPermissionService::new();
+        permission_service
+            .expect_check_permission()
+            .times(1)
+            .returning(|_| Err(service::ServiceError::Forbidden));
+
+        let hello_service =
+            HelloServiceImpl::new(Arc::new(hello_dao), Arc::new(permission_service));
+        if let Err(service::ServiceError::Forbidden) = hello_service.hello().await {
+            // All good
+        } else {
+            panic!("Expected forbidden error");
+        }
+    }
+
+    #[tokio::test]
+    async fn test_check_permission() {
+        let mut permission_dao = dao::MockPermissionDao::new();
+        permission_dao
+            .expect_has_privilege()
+            .with(eq("DEVUSER"), eq("hello"))
+            .returning(|_, _| Ok(true));
+
+        let mut user_service = service::MockUserService::new();
+        user_service
+            .expect_current_user()
+            .returning(|| Ok("DEVUSER".into()));
+
+        let permission_service =
+            PermissionServiceImpl::new(Arc::new(permission_dao), Arc::new(user_service));
+        let result = permission_service.check_permission("hello").await;
+        result.expect("Expected successful authorization");
+    }
+
+    #[tokio::test]
+    async fn test_check_permission_denied() {
+        let mut permission_dao = dao::MockPermissionDao::new();
+        permission_dao
+            .expect_has_privilege()
+            .with(eq("DEVUSER"), eq("hello"))
+            .returning(|_, _| Ok(false));
+
+        let mut user_service = service::MockUserService::new();
+        user_service
+            .expect_current_user()
+            .returning(|| Ok("DEVUSER".into()));
+
+        let permission_service =
+            PermissionServiceImpl::new(Arc::new(permission_dao), Arc::new(user_service));
+        let result = permission_service.check_permission("hello").await;
+        if let Err(service::ServiceError::Forbidden) = result {
+            // All good
+        } else {
+            panic!("Expected forbidden error");
+        }
+    }
+
+    #[tokio::test]
+    async fn test_user_service_dev() {
+        use service::UserService;
+        let user_service = UserServiceDev;
+        assert_eq!(
+            "DEVUSER",
+            user_service.current_user().await.unwrap().as_ref()
+        );
+    }
+}