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test(watch): add same value skipping trigger test

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This commit is contained in:
Evan You 2020-08-14 17:35:49 -04:00
parent 517c2b8bdb
commit 223f180529
1 changed files with 15 additions and 0 deletions
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15
packages/runtime-core/__tests__/apiWatch.spec.ts
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@ -77,6 +77,21 @@ describe('api: watch', () => {
expect(spy).toBeCalledWith([1], expect.anything(), expect.anything()) expect(spy).toBeCalledWith([1], expect.anything(), expect.anything())
}) })
it('should not fire if watched getter result did not change', async () => {
const spy = jest.fn()
const n = ref(0)
watch(() => n.value % 2, spy)
n.value++
await nextTick()
expect(spy).toBeCalledTimes(1)
n.value += 2
await nextTick()
// should not be called again because getter result did not change
expect(spy).toBeCalledTimes(1)
})
it('watching single source: computed ref', async () => { it('watching single source: computed ref', async () => {
const count = ref(0) const count = ref(0)
const plus = computed(() => count.value + 1) const plus = computed(() => count.value + 1)