Nuxt/test/unit/renderer.test.js

import consola from 'consola'
import { Nuxt } from '../utils'

const NO_BUILD_MSG = 'No build files found. Use either `nuxt build` or `builder.build()` or start nuxt in development mode.'

describe('renderer', () => {
  test('detect no-build (Universal)', async () => {
    const nuxt = new Nuxt({
      _start: true,
      mode: 'universal',
      dev: false,
      buildDir: '/path/to/404'
    })
    await nuxt.ready()
    await expect(nuxt.renderer.renderer.isReady).toBe(false)
    expect(consola.fatal).toHaveBeenCalledWith(new Error(NO_BUILD_MSG))
  })

  test('detect no-build (SPA)', async () => {
    const nuxt = new Nuxt({
      _start: true,
      mode: 'spa',
      dev: false,
      buildDir: '/path/to/404'
    })
    await nuxt.ready()
    await expect(nuxt.renderer.renderer.isReady).toBe(false)
    expect(consola.fatal).toHaveBeenCalledWith(new Error(NO_BUILD_MSG))
  })
})