我有以下代码：

companion object {
        val COMPARATOR = object : DiffUtil.ItemCallback<Reservation>() {
            override fun areContentsTheSame(oldItem: Reservation,newItem: Reservation): Boolean =
                oldItem == newItem

            override fun areItemsTheSame(oldItem: Reservation,newItem: Reservation): Boolean =
                oldItem.id == newItem.id
        }
    }

我需要像这样将模拟传递给shallowMount：

this.$vs.loading()
....
this.$vs.loading.close()

但是我该如何嘲笑const vs = { loading: jest.fn() } mocks: { $vs: vs } 和loading？

我使用close来模拟loading: jest.fn()。如何在loading()属性中模拟close()？