Function factory

packages/runtime-core/__tests__/helpers/useId.spec.ts:77–93

(
      delay1: number,
      delay2: number,
    )

  test('async component', async () => {
    const factory = (
      delay1: number,
      delay2: number,
    ): ReturnType<TestCaseFactory> => {
      const p1 = promiseWithDelay(BasicComponentWithUseId, delay1)
      const p2 = promiseWithDelay(BasicComponentWithUseId, delay2)
      const AsyncOne = defineAsyncComponent(() => p1)
      const AsyncTwo = defineAsyncComponent(() => p2)
      const app = createApp({
        setup() {
          const id1 = useId()
          const id2 = useId()
          return () => [id1, ' ', id2, ' ', h(AsyncOne), ' ', h(AsyncTwo)]
        },
      })
      return [app, [p1, p2]]
    }

    const expected =
      'v-0 v-1 ' + // root