code refactor

Reviewed-on: #26

crates/application/tests/import/cleanup_test.rs

@@ -0,0 +1,14 @@
+use std::sync::Arc;
+
+use domain::testing::InMemoryStore;
+
+use application::import::cleanup;
+
+#[tokio::test]
+async fn returns_zero_when_nothing_expired() {
+    let sessions = InMemoryStore::new();
+
+    let result = cleanup::execute(Arc::clone(&sessions) as _).await.unwrap();
+
+    assert_eq!(result, 0);
+}