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watcher.spec.js
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watcher.spec.js
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import Vue from 'vue'
import Watcher from 'core/observer/watcher'
describe('Watcher', () => {
let vm, spy
beforeEach(() => {
vm = new Vue({
template: '<div></div>',
data: {
a: 1,
b: {
c: 2,
d: 4
},
c: 'c',
msg: 'yo'
}
}).$mount()
spy = jasmine.createSpy('watcher')
})
it('path', done => {
const watcher = new Watcher(vm, 'b.c', spy)
expect(watcher.value).toBe(2)
vm.b.c = 3
waitForUpdate(() => {
expect(watcher.value).toBe(3)
expect(spy).toHaveBeenCalledWith(3, 2)
vm.b = { c: 4 } // swapping the object
}).then(() => {
expect(watcher.value).toBe(4)
expect(spy).toHaveBeenCalledWith(4, 3)
}).then(done)
})
it('non-existent path, set later', done => {
const watcher1 = new Watcher(vm, 'b.e', spy)
expect(watcher1.value).toBeUndefined()
// check $add should not affect isolated children
const child2 = new Vue({ parent: vm })
const watcher2 = new Watcher(child2, 'b.e', spy)
expect(watcher2.value).toBeUndefined()
Vue.set(vm.b, 'e', 123)
waitForUpdate(() => {
expect(watcher1.value).toBe(123)
expect(watcher2.value).toBeUndefined()
expect(spy.calls.count()).toBe(1)
expect(spy).toHaveBeenCalledWith(123, undefined)
}).then(done)
})
it('delete', done => {
const watcher = new Watcher(vm, 'b.c', spy)
expect(watcher.value).toBe(2)
Vue.delete(vm.b, 'c')
waitForUpdate(() => {
expect(watcher.value).toBeUndefined()
expect(spy).toHaveBeenCalledWith(undefined, 2)
}).then(done)
})
it('path containing $data', done => {
const watcher = new Watcher(vm, '$data.b.c', spy)
expect(watcher.value).toBe(2)
vm.b = { c: 3 }
waitForUpdate(() => {
expect(watcher.value).toBe(3)
expect(spy).toHaveBeenCalledWith(3, 2)
vm.$data.b.c = 4
}).then(() => {
expect(watcher.value).toBe(4)
expect(spy).toHaveBeenCalledWith(4, 3)
}).then(done)
})
it('deep watch', done => {
let oldB
new Watcher(vm, 'b', spy, {
deep: true
})
vm.b.c = { d: 4 }
waitForUpdate(() => {
expect(spy).toHaveBeenCalledWith(vm.b, vm.b)
oldB = vm.b
vm.b = { c: [{ a: 1 }] }
}).then(() => {
expect(spy).toHaveBeenCalledWith(vm.b, oldB)
expect(spy.calls.count()).toBe(2)
vm.b.c[0].a = 2
}).then(() => {
expect(spy).toHaveBeenCalledWith(vm.b, vm.b)
expect(spy.calls.count()).toBe(3)
}).then(done)
})
it('deep watch $data', done => {
new Watcher(vm, '$data', spy, {
deep: true
})
vm.b.c = 3
waitForUpdate(() => {
expect(spy).toHaveBeenCalledWith(vm.$data, vm.$data)
}).then(done)
})
it('deep watch with circular references', done => {
new Watcher(vm, 'b', spy, {
deep: true
})
Vue.set(vm.b, '_', vm.b)
waitForUpdate(() => {
expect(spy).toHaveBeenCalledWith(vm.b, vm.b)
expect(spy.calls.count()).toBe(1)
vm.b._.c = 1
}).then(() => {
expect(spy).toHaveBeenCalledWith(vm.b, vm.b)
expect(spy.calls.count()).toBe(2)
}).then(done)
})
it('fire change for prop addition/deletion in non-deep mode', done => {
new Watcher(vm, 'b', spy)
Vue.set(vm.b, 'e', 123)
waitForUpdate(() => {
expect(spy).toHaveBeenCalledWith(vm.b, vm.b)
expect(spy.calls.count()).toBe(1)
Vue.delete(vm.b, 'e')
}).then(() => {
expect(spy.calls.count()).toBe(2)
}).then(done)
})
it('watch function', done => {
const watcher = new Watcher(vm, function () {
return this.a + this.b.d
}, spy)
expect(watcher.value).toBe(5)
vm.a = 2
waitForUpdate(() => {
expect(spy).toHaveBeenCalledWith(6, 5)
vm.b = { d: 2 }
}).then(() => {
expect(spy).toHaveBeenCalledWith(4, 6)
}).then(done)
})
it('computed mode, lazy', done => {
let getterCallCount = 0
const watcher = new Watcher(vm, function () {
getterCallCount++
return this.a + this.b.d
}, null, { computed: true })
expect(getterCallCount).toBe(0)
expect(watcher.computed).toBe(true)
expect(watcher.value).toBeUndefined()
expect(watcher.dirty).toBe(true)
expect(watcher.dep).toBeTruthy()
const value = watcher.evaluate()
expect(getterCallCount).toBe(1)
expect(value).toBe(5)
expect(watcher.value).toBe(5)
expect(watcher.dirty).toBe(false)
// should not get again if not dirty
watcher.evaluate()
expect(getterCallCount).toBe(1)
vm.a = 2
waitForUpdate(() => {
expect(getterCallCount).toBe(1)
expect(watcher.value).toBe(5)
expect(watcher.dirty).toBe(true)
const value = watcher.evaluate()
expect(getterCallCount).toBe(2)
expect(value).toBe(6)
expect(watcher.value).toBe(6)
expect(watcher.dirty).toBe(false)
}).then(done)
})
it('computed mode, activated', done => {
let getterCallCount = 0
const watcher = new Watcher(vm, function () {
getterCallCount++
return this.a + this.b.d
}, null, { computed: true })
// activate by mocking a subscriber
const subMock = jasmine.createSpyObj('sub', ['update'])
watcher.dep.addSub(subMock)
const value = watcher.evaluate()
expect(getterCallCount).toBe(1)
expect(value).toBe(5)
vm.a = 2
waitForUpdate(() => {
expect(getterCallCount).toBe(2)
expect(subMock.update).toHaveBeenCalled()
// since already computed, calling evaluate again should not trigger
// getter
watcher.evaluate()
expect(getterCallCount).toBe(2)
}).then(done)
})
it('teardown', done => {
const watcher = new Watcher(vm, 'b.c', spy)
watcher.teardown()
vm.b.c = 3
waitForUpdate(() => {
expect(watcher.active).toBe(false)
expect(spy).not.toHaveBeenCalled()
}).then(done)
})
it('warn not support path', () => {
new Watcher(vm, 'd.e + c', spy)
expect('Failed watching path:').toHaveBeenWarned()
})
})