findUser.spec.js

const expect = require('chai').expect;
const sinon = require('sinon');

const UserManager = require('../../user/user.manager');

describe('userManger', () => {
    let userManager = null;
    let sandbox = sinon.createSandbox();
    const findUserStub = sandbox.stub();

    const fakeDB = {
        collection: sinon.fake.returns({
            findOne: findUserStub
        })
    }

    before(() => {
        userManager = new UserManager(fakeDB);
        expect(fakeDB.collection.args[0][0]).to.be.equal('user');
        expect(fakeDB.collection.calledOnce).to.be.equal(true);
    })

    afterEach(()=>{
        sandbox.restore();
    })

    describe('findUser', () => {
        it('find existed user', async () => {
            const account = "test";
            const password = "test";
            const otherProp = "test";
            findUserStub.returns({
                account,
                password,
                otherProp
            })

            const user = await userManager.findUser({
                account,
                password
            })

            expect(user).to.deep.equal({
                account,
                password,
                otherProp
            })
        })
    })
})