在使用 Postgres、chai 和 mocha 时为节点 Rest api 编写单元测试的最佳方法？

Question

I am working on node js rest api in which database is Postgres and we are not using any ORM. How I am writing is as below which is hitting database for create and update

it('it should create customer', (done) => {
  const payload = {
    customerId: "test",
    customerName: "test",
    customerAddress: "Some place, NWZ"
  }
  chai
    .request(server)
    .post('/customer')
    .send(payload)
    .end((err, res) => {
      res.should.have.status(200);
      res.body.success.should.equal(true);
      done();
    });
});

Now I want to know that what is best way to write unit test cases? Like

1. Should I write unit test cases by mocking api response excluding database query?
2. Or should I write unit test case which will hit database?

Or in any way we can mock database? What is best way to do it?

Answer 1

There is some debate regarding whether unit tests should hit database. But in general, I would say hitting a real database in testing should be categories as integration test, not unit test.

So for your question 2: I would say: no, you should not write unit test case that hit database.

Then for your question 1: yes, you should mocking api response, the library you could choose, eg sinon.