import mongoose from 'mongoose'
import Sheet from '../sheet'

describe('[Models] Sheet Model', () => {
  it('implements optimistic concurrency control', async () => {
    const sheet = new Sheet({ title: 'Test Sheet', owner: new mongoose.Types.ObjectId().toHexString() })
    await sheet.save()

    const copies = [
      await Sheet.findById(sheet.id),
      await Sheet.findById(sheet.id)
    ]

    copies[0].set({ title: 'Updated Title' })
    copies[1].set({ title: 'Updated Title' })

    await copies[0].save()
    
    try {
      await copies[1].save()
    } catch {
      return
    }

    throw new Error('Sheet was saved when it should not have been')
  })

  it('increments the version number on update', async () => {
    const sheet = new Sheet({ title: 'Test Sheet', owner: new mongoose.Types.ObjectId().toHexString() })
    await sheet.save()
    expect(sheet.version).toEqual(0)
    await sheet.save()
    expect(sheet.version).toEqual(1)
    await sheet.save()
    expect(sheet.version).toEqual(2)
  })
})