getting-started/app/spec/routes/getItems.spec.js

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const db = require('../../src/persistence');
const getItems = require('../../src/routes/getItems');
const ITEMS = [{ id: 12345 }];
jest.mock('../../src/persistence', () => ({
getItems: jest.fn(),
}));
test('it gets items correctly', async () => {
const req = {};
const res = { send: jest.fn() };
db.getItems.mockReturnValue(Promise.resolve(ITEMS));
await getItems(req, res);
expect(db.getItems.mock.calls.length).toBe(1);
expect(res.send.mock.calls[0].length).toBe(1);
expect(res.send.mock.calls[0][0]).toEqual(ITEMS);
});