import { databaseFactory } from './database'
import { LocalStorage } from './local-storage'
import { MemoryStorage } from './memory-storage'

describe('databaseFactory', () => {
  beforeEach(() => {
    // restore the spy created with spyOn
    jest.restoreAllMocks()
  })
  it('should return a LocalStorage instance if local storage is enabled', () => {
    jest.spyOn(Storage.prototype, 'setItem').mockImplementation(() => {})
    jest.spyOn(Storage.prototype, 'removeItem').mockImplementation(() => {})

    const result = databaseFactory()

    expect(result).toBeInstanceOf(LocalStorage)
  })

  it('should return a MemoryStorage instance if local storage is not enabled', () => {
    jest.spyOn(Storage.prototype, 'setItem').mockImplementation(() => {
      throw new Error('Local storage not available')
    })
    jest.spyOn(Storage.prototype, 'removeItem').mockImplementation(() => {})

    const result = databaseFactory()

    expect(result).toBeInstanceOf(MemoryStorage)
  })
})