How can I mock a fake database for when unit testing against Knex?

Question

I\'ve been using Knex successfully to connect to a backend database. But I want to be able to unit test my code. Is there a way to mock the database connection?

I\'ve tr

Answer 1

I'm using jest and you can do something like this:

   jest.mock('knex', () => {
        const fn = () => {
            return {
                select: jest.fn().mockReturnThis(),
                from: jest.fn().mockReturnThis(),
                where: jest.fn().mockReturnThis(),
                first: jest.fn().mockReturnThis(),
                insert: jest.fn().mockReturnThis(),
                raw: jest.fn().mockReturnThis(),
                then: jest.fn(function (done) {
                  done(null)
                })
                
            }
        }
        return fn
    })