How do you mock Firebase Firestore methods using Jest?

Question

I have a series of functions, each performing various firestore interactions. How do I use Jest to mock these firestore calls? I would like to avoid using a library.

Answer 1

I found that mocking the import works well. I added this code in the test, above where I render my component importing 'firebase/app'

jest.mock('firebase/app', () => ({
  __esModule: true,
  default: {
    apps: [],
    initializeApp: () => {},
    auth: () => {},
  },
}));