- update: database client to implement a database trait so we can mock it out

- update unit tests
- add: database client mock

auth-service/src/mocks/database_client_mock.rs

@@ -0,0 +1,23 @@
+use mockall::{mock, predicate::*};
+use async_trait::async_trait;
+use crate::database::{CreateUserResponse, GetUserResponse};
+use crate::database_client::{DatabaseClientTrait};
+
+#[cfg(test)]
+mock! {
+    pub DatabaseClient {}
+
+    #[async_trait]
+    impl DatabaseClientTrait for DatabaseClient {
+        async fn connect(endpoint: &str) -> Result<Self, Box<dyn std::error::Error>>;
+        async fn get_user_by_userid(&mut self, user_id: i32) -> Result<GetUserResponse, Box<dyn std::error::Error>>;
+        async fn get_user_by_username(&mut self, user_id: &str) -> Result<GetUserResponse, Box<dyn std::error::Error>>;
+        async fn create_user(&mut self, username: &str, email: &str, password: &str) -> Result<CreateUserResponse, Box<dyn std::error::Error>>;
+    }
+}
+
+impl Clone for MockDatabaseClient {
+    fn clone(&self) -> Self {
+        MockDatabaseClient::new() // Create a new mock instance
+    }
+}

auth-service/src/mocks/mod.rs

@@ -0,0 +1,2 @@
+#[cfg(test)]
+pub mod database_client_mock;