vue3-yuanma/packages/reactivity/__tests__/computed.spec.ts
2019-08-20 09:58:10 -04:00

129 lines
3.2 KiB
TypeScript

import { computed, reactive, effect, stop } from '../src'
describe('reactivity/computed', () => {
it('should return updated value', () => {
const value: any = reactive({})
const cValue = computed(() => value.foo)
expect(cValue.value).toBe(undefined)
value.foo = 1
expect(cValue.value).toBe(1)
})
it('should compute lazily', () => {
const value: any = reactive({})
const getter = jest.fn(() => value.foo)
const cValue = computed(getter)
// lazy
expect(getter).not.toHaveBeenCalled()
expect(cValue.value).toBe(undefined)
expect(getter).toHaveBeenCalledTimes(1)
// should not compute again
cValue.value
expect(getter).toHaveBeenCalledTimes(1)
// should not compute until needed
value.foo = 1
expect(getter).toHaveBeenCalledTimes(1)
// now it should compute
expect(cValue.value).toBe(1)
expect(getter).toHaveBeenCalledTimes(2)
// should not compute again
cValue.value
expect(getter).toHaveBeenCalledTimes(2)
})
it('should trigger effect', () => {
const value: any = reactive({})
const cValue = computed(() => value.foo)
let dummy
effect(() => {
dummy = cValue.value
})
expect(dummy).toBe(undefined)
value.foo = 1
expect(dummy).toBe(1)
})
it('should work when chained', () => {
const value: any = reactive({ foo: 0 })
const c1 = computed(() => value.foo)
const c2 = computed(() => c1.value + 1)
expect(c2.value).toBe(1)
expect(c1.value).toBe(0)
value.foo++
expect(c2.value).toBe(2)
expect(c1.value).toBe(1)
})
it('should trigger effect when chained', () => {
const value: any = reactive({ foo: 0 })
const getter1 = jest.fn(() => value.foo)
const getter2 = jest.fn(() => {
return c1.value + 1
})
const c1 = computed(getter1)
const c2 = computed(getter2)
let dummy
effect(() => {
dummy = c2.value
})
expect(dummy).toBe(1)
expect(getter1).toHaveBeenCalledTimes(1)
expect(getter2).toHaveBeenCalledTimes(1)
value.foo++
expect(dummy).toBe(2)
// should not result in duplicate calls
expect(getter1).toHaveBeenCalledTimes(2)
expect(getter2).toHaveBeenCalledTimes(2)
})
it('should trigger effect when chained (mixed invocations)', () => {
const value: any = reactive({ foo: 0 })
const getter1 = jest.fn(() => value.foo)
const getter2 = jest.fn(() => {
return c1.value + 1
})
const c1 = computed(getter1)
const c2 = computed(getter2)
let dummy
effect(() => {
dummy = c1.value + c2.value
})
expect(dummy).toBe(1)
expect(getter1).toHaveBeenCalledTimes(1)
expect(getter2).toHaveBeenCalledTimes(1)
value.foo++
expect(dummy).toBe(3)
// should not result in duplicate calls
expect(getter1).toHaveBeenCalledTimes(2)
expect(getter2).toHaveBeenCalledTimes(2)
})
it('should no longer update when stopped', () => {
const value: any = reactive({})
const cValue = computed(() => value.foo)
let dummy
effect(() => {
dummy = cValue.value
})
expect(dummy).toBe(undefined)
value.foo = 1
expect(dummy).toBe(1)
stop(cValue.effect)
value.foo = 2
expect(dummy).toBe(1)
})
it('should support setter', () => {
// TODO
})
})