Nuxt/test/utils/build.js

import { loadFixture, Nuxt, Builder, BundleBuilder } from './index'

export const buildFixture = function (fixture, callback, hooks = [], overrides) {
  let nuxt

  test(`Build ${fixture}`, async () => {
    const config = await loadFixture(fixture, overrides)
    nuxt = new Nuxt(config)

    const buildDone = jest.fn()
    hooks.forEach(([hook, fn]) => nuxt.hook(hook, fn))
    nuxt.hook('build:done', buildDone)
    const builder = await new Builder(nuxt, BundleBuilder).build()
    // 2: BUILD_DONE
    expect(builder._buildStatus).toBe(2)
    expect(buildDone).toHaveBeenCalledTimes(1)
    if (typeof callback === 'function') {
      callback(builder)
    }
  }, 120000)
}