140 lines
3.5 KiB
TypeScript
140 lines
3.5 KiB
TypeScript
import { computed, observable, effect, stop } from '../src'
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describe('observer/computed', () => {
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it('should return updated value', () => {
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const value: any = observable({})
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const cValue = computed(() => value.foo)
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expect(cValue()).toBe(undefined)
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value.foo = 1
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expect(cValue()).toBe(1)
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})
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it('should compute lazily', () => {
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const value: any = observable({})
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const getter = jest.fn(() => value.foo)
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const cValue = computed(getter)
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// lazy
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expect(getter).not.toHaveBeenCalled()
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expect(cValue()).toBe(undefined)
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expect(getter).toHaveBeenCalledTimes(1)
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// should not compute again
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cValue()
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expect(getter).toHaveBeenCalledTimes(1)
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// should not compute until needed
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value.foo = 1
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expect(getter).toHaveBeenCalledTimes(1)
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// now it should compute
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expect(cValue()).toBe(1)
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expect(getter).toHaveBeenCalledTimes(2)
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// should not compute again
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cValue()
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expect(getter).toHaveBeenCalledTimes(2)
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})
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it('should accept context', () => {
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const value: any = observable({})
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let callCtx, callArg
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const getter = function(arg: any) {
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callCtx = this
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callArg = arg
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return value.foo
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}
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const ctx = {}
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const cValue = computed(getter, ctx)
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cValue()
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expect(callCtx).toBe(ctx)
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expect(callArg).toBe(ctx)
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})
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it('should trigger effect', () => {
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const value: any = observable({})
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const cValue = computed(() => value.foo)
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let dummy
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effect(() => {
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dummy = cValue()
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})
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expect(dummy).toBe(undefined)
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value.foo = 1
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expect(dummy).toBe(1)
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})
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it('should work when chained', () => {
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const value: any = observable({ foo: 0 })
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const c1 = computed(() => value.foo)
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const c2 = computed(() => c1() + 1)
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expect(c2()).toBe(1)
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expect(c1()).toBe(0)
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value.foo++
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expect(c2()).toBe(2)
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expect(c1()).toBe(1)
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})
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it('should trigger effect when chained', () => {
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const value: any = observable({ foo: 0 })
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const getter1 = jest.fn(() => value.foo)
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const getter2 = jest.fn(() => {
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return c1() + 1
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})
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const c1 = computed(getter1)
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const c2 = computed(getter2)
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let dummy
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effect(() => {
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dummy = c2()
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})
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expect(dummy).toBe(1)
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expect(getter1).toHaveBeenCalledTimes(1)
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expect(getter2).toHaveBeenCalledTimes(1)
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value.foo++
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expect(dummy).toBe(2)
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// should not result in duplicate calls
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expect(getter1).toHaveBeenCalledTimes(2)
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expect(getter2).toHaveBeenCalledTimes(2)
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})
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it('should trigger effect when chained (mixed invocations)', () => {
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const value: any = observable({ foo: 0 })
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const getter1 = jest.fn(() => value.foo)
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const getter2 = jest.fn(() => {
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return c1() + 1
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})
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const c1 = computed(getter1)
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const c2 = computed(getter2)
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let dummy
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effect(() => {
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dummy = c1() + c2()
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})
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expect(dummy).toBe(1)
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expect(getter1).toHaveBeenCalledTimes(1)
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expect(getter2).toHaveBeenCalledTimes(1)
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value.foo++
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expect(dummy).toBe(3)
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// should not result in duplicate calls
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expect(getter1).toHaveBeenCalledTimes(2)
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expect(getter2).toHaveBeenCalledTimes(2)
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})
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it('should no longer update when stopped', () => {
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const value: any = observable({})
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const cValue = computed(() => value.foo)
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let dummy
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effect(() => {
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dummy = cValue()
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})
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expect(dummy).toBe(undefined)
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value.foo = 1
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expect(dummy).toBe(1)
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stop(cValue.effect)
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value.foo = 2
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expect(dummy).toBe(1)
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})
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})
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