假設(shè)您有以下操作export const startAddExpense = (expenseData = {}) => {  return (dispatch) => {    const {      description = '',      note = '',      amount = 0,      createdAt = 0    } = expenseData;    const expense = { description, note, amount, createdAt };    return database.ref('expenses').push(expense).then((ref) => {      dispatch(addExpense({        id: ref.key,        ...expense      }));    });  };};我將費(fèi)用數(shù)據(jù)存儲到數(shù)據(jù)庫（在我的情況下是火庫），然后將addExpense函數(shù)發(fā)送到商店這是對它的測試。test('should add expense to database and store', (done) => {    const store = createMockStore({});    const expenseData = {      description: 'Mouse',      amount: 3000,      note: 'This one is better',      createdAt: 1000    };    store.dispatch(startAddExpense(expenseData)).then(() => {      expect(1).toBe(1);      done();    });});done（） 函數(shù)的含義是什么？這是否意味著回調(diào)函數(shù)應(yīng)該等到在 firebase 數(shù)據(jù)庫中插入數(shù)據(jù)完成？謝謝 西奧