Before moving to connection pooling for the DB

backend/tests/common/mod.rs

@@ -0,0 +1,29 @@
+use include_dir::{Dir, include_dir};
+use log::{debug, error};
+use rusqlite::Connection;
+use rusqlite_migration::Migrations;
+use std::result::Result;
+use std::sync::LazyLock;
+use tokio::sync::Mutex;
+
+use crate::settings;
+
+static TEST_MIGRATIONS_DIR: Dir = include_dir!("$CARGO_MANIFEST_DIR/tests/database_migrations");
+
+// Define migrations. These are applied atomically.
+static TEST_MIGRATIONS: LazyLock<Migrations<'static>> =
+    LazyLock::new(|| Migrations::from_directory(&TEST_MIGRATIONS_DIR).unwrap());
+
+static INITIALISED: Mutex<bool> = Mutex::const_new(false);
+
+pub async fn setup_database() {
+    let mut initialised = INITIALISED.lock().await;
+    if *initialised {
+        return;
+    }
+
+    let conn = db::init_db().unwrap();
+    TEST_MIGRATIONS.to_latest(&mut conn).unwrap();
+
+    *initialised = true;
+}

backend/tests/database_migrations/01-notifications/up.sql

@@ -0,0 +1 @@
+INSERT INTO NOTIFICATIONS (id, created_on, notification_type, title, body, is_new) VALUES (1, '2026-01-03 14:13:12', 'NewDeviceFound', 'Title new device found', 'Body new device found', 1);