Testing firestore queries

query-example.js

// These are the mocked version of some firestore methods
// And we want to assert they are called correctly
const {
  mockCollection,
  mockGet,
  mockWhere,
} = require('firestore-jest-mock/mocks/firestore');

const { mockFirebase } = require('firestore-jest-mock');

describe('Querying events', () => {
  mockFirebase({
    database: {
      events: [{ id: 'abc123', state: 'vermont' }, { id: '123abc', state: 'maine' }]
    }
  });
  
  test('It can query by state', async () => {
    // From https://gist.github.com/sbatson5/c9d018a3d46de1ce6be770848f88e47f
    maybeGetEventsByState('vermont');

    // Assert we are looking at the right collection
    expect(mockCollection).toHaveBeenCalledWith('events');
    // Assert that the correct state was queried
    expect(mockWhere).toHaveBeenCalledWith('state', '==', 'vermont');
    // Assert that we finally request the data
    expect(mockGet).toHaveBeenCalled();
  });
    
  test('It can request all', async () => {
    // From https://gist.github.com/sbatson5/c9d018a3d46de1ce6be770848f88e47f
    maybeGetEventsByState();

    // Assert we are looking at the right collection
    expect(mockCollection).toHaveBeenCalledWith('events');
    // Assert that we make no queries
    expect(mockWhere).not.toHaveBeenCalled();
    // Assert that we finally request the data
    expect(mockGet).toHaveBeenCalled();
  });
});