node-uci/src/Engine/__test__/sendCmd.test.js

Universal Chess Interface protocol implementation for node.js

import { EOL } from 'os'

import Engine from '../'
import { syncify, engineInit } from '../../__test__/util'

jest.mock('child_process')
import { cpMock } from 'child_process'

describe('sendCmd', () => {
  it('should reject if process not running', async () => {
    const fn = await syncify(async () => {
      const p = new Engine('').sendCmd('test')
      await p
    })

    expect(fn).toThrow()
  })

  it('should send cmd to proc stdout', async () => {
    const p = await engineInit(cpMock)
    p.sendCmd('test 123')

    expect(cpMock.stdin.write).toHaveBeenCalledWith(`test 123${EOL}`)
  })

  it('should resolve this.isready', async () => {
    const p = await engineInit(cpMock)
    p.isready = jest.fn()
    p.sendCmd('test 123')

    expect(p.isready).toHaveBeenCalledTimes(1)
  })
})

//to group some for before/afterEach
describe('setoption, ucinewgame, ponderhit, position', () => {
  let engine

  beforeEach(async () => {
    engine = await engineInit(cpMock)
    engine.sendCmd = jest.fn()
  })

  describe('setoption', () => {
    it('should call this.sendCmd("setoption name <id>")', () => {
      engine.setoption('optName')

      expect(engine.sendCmd).toHaveBeenCalledWith('setoption name optName')
    })

    it('should call this.sendCmd("setoption name <id> value <x>")', () => {
      engine.setoption('optName', '39')

      expect(engine.sendCmd).toHaveBeenCalledWith(
        'setoption name optName value 39',
      )
    })

    it('should update this.options with new option on success', async () => {
      let p = engine.setoption('opt', -24)
      cpMock.readyok()
      await p

      expect(engine.options.get('opt')).toBe(-24)
    })

    it('should coerce value into string")', () => {
      engine.setoption('Ponder', false)

      expect(engine.sendCmd).toHaveBeenCalledWith(
        'setoption name Ponder value false',
      )
    })
  })

  describe('ucinewgame', () => {
    it('should call this.sendCmd', () => {
      engine.ucinewgame()

      expect(engine.sendCmd).toHaveBeenCalledWith('ucinewgame')
    })
  })

  describe('ponderhit', () => {
    it('should call this.sendCmd', () => {
      engine.ponderhit()

      expect(engine.sendCmd).toHaveBeenCalledWith('ponderhit')
    })
  })

  describe('position', () => {
    it('should call this.sendCmd("position startpos")', () => {
      engine.position('startpos')

      expect(engine.sendCmd).toHaveBeenCalledWith('position startpos')
    })

    it('should call this.sendCmd("position startpos moves <move1> ... <moven>")', () => {
      engine.position('startpos', ['e2e4', 'd7d5', 'e4d5'])

      expect(engine.sendCmd).toHaveBeenCalledWith(
        'position startpos moves e2e4 d7d5 e4d5',
      )
    })

    it('should call this.sendCmd("position fen")', () => {
      engine.position(
        'r1bqkbnr/pppp1ppp/2n5/1B2p3/4P3/5N2/PPPP1PPP/RNBQK2R b KQkq - 3 3',
      )

      expect(engine.sendCmd).toHaveBeenCalledWith(
        'position fen r1bqkbnr/pppp1ppp/2n5/1B2p3/4P3/5N2/PPPP1PPP/RNBQK2R b KQkq - 3 3',
      )
    })
  })
})