import { expect } from 'chai'
import { CallbacksRegistry } from '../lib/renderer/callbacks-registry'

describe('CallbacksRegistry module', () => {
  let registry: CallbacksRegistry

  beforeEach(() => {
    registry = new CallbacksRegistry()
  })

  it('adds a callback to the registry', () => {
    const cb = () => [1, 2, 3, 4, 5]
    const key = registry.add(cb)

    expect(key).to.exist('key')
  })

  it('returns a specified callback if it is in the registry', () => {
    const cb = () => [1, 2, 3, 4, 5]
    const key = registry.add(cb)
    expect(key).to.exist('key')
    const callback = registry.get(key!)

    expect(callback.toString()).equal(cb.toString())
  })

  it('returns an empty function if the cb doesnt exist', () => {
    const callback = registry.get(1)

    expect(callback).to.be.a('function')
  })

  it('removes a callback to the registry', () => {
    const cb = () => [1, 2, 3, 4, 5]
    const key = registry.add(cb)
    expect(key).to.exist('key')

    registry.remove(key!)
    const afterCB = registry.get(key!)

    expect(afterCB).to.be.a('function')
    expect(afterCB.toString()).to.not.equal(cb.toString())
  })
})