add mock database

packages/backend/native-utils/crates/database/Cargo.toml

@@ -7,5 +7,5 @@ edition = "2021"
 
 [dependencies]
 once_cell = "1.17.1"
-sea-orm = { version = "0.11.3", features = ["sqlx-postgres", "runtime-tokio-rustls"] }
+sea-orm = { version = "0.11.3", features = ["sqlx-postgres", "runtime-tokio-rustls", "mock"] }
 thiserror = "1.0.40"

packages/backend/native-utils/crates/database/src/lib.rs

@@ -1,11 +1,13 @@
 pub mod error;
 
-use once_cell::sync::OnceCell;
-use sea_orm::{Database, DatabaseConnection};
+use once_cell::sync::{Lazy, OnceCell};
+use sea_orm::{Database, DatabaseBackend, DatabaseConnection, MockDatabase};
 
 use crate::error::Error;
 
 static DB_CONN: OnceCell<DatabaseConnection> = OnceCell::new();
+static DB_MOCK: Lazy<DatabaseConnection> =
+    Lazy::new(|| MockDatabase::new(DatabaseBackend::Postgres).into_connection());
 
 pub async fn init_database(connection_uri: impl Into<String>) -> Result<(), Error> {
     let conn = Database::connect(connection_uri.into()).await?;
@@ -14,5 +16,19 @@ pub async fn init_database(connection_uri: impl Into<String>) -> Result<(), Erro
 }
 
 pub fn get_database() -> Result<&'static DatabaseConnection, Error> {
+    if cfg!(test) {
+        Ok(&DB_MOCK)
+    } else {
         DB_CONN.get().ok_or(Error::Uninitialized)
     }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::get_database;
+
+    #[test]
+    fn can_get_mock_without_initialization() {
+        assert!(get_database().is_ok());
+    }
+}