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index.test.ts
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index.test.ts
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import { computed, ref } from 'vue-demi'
import { useTitle } from '.'
describe('useTitle', () => {
it('throws error when using both `observe` and `titleTemplate`', () => {
expect(() => {
useTitle(null, { observe: true, titleTemplate: '%s' })
}).toThrowErrorMatchingInlineSnapshot('"Cannot use `observe` and `titleTemplate` together."')
})
it('without param', () => {
const title = useTitle()
expect(title.value).toEqual('')
title.value = 'new title'
expect(title.value).toEqual('new title')
})
describe('with writable param', () => {
it('string', () => {
const title = useTitle('old title')
expect(title.value).toEqual('old title')
title.value = 'new title'
expect(title.value).toEqual('new title')
})
it('null', () => {
const title = useTitle(null)
expect(title.value).toEqual('')
title.value = 'new title'
expect(title.value).toEqual('new title')
})
it('undefined', () => {
const title = useTitle(undefined)
expect(title.value).toEqual('')
title.value = 'new title'
expect(title.value).toEqual('new title')
})
describe('ref param', () => {
it('string', () => {
const targetRef = ref('old title')
const title = useTitle(targetRef)
expect(title.value).toEqual('old title')
targetRef.value = 'new title'
expect(title.value).toEqual('new title')
title.value = 'latest title'
expect(title.value).toEqual('latest title')
})
it('null', () => {
const targetRef = ref<null | string>(null)
const title = useTitle(targetRef)
expect(title.value).toEqual(null)
targetRef.value = 'new title'
expect(title.value).toEqual('new title')
title.value = 'latest title'
expect(title.value).toEqual('latest title')
})
it('undefined', () => {
const targetRef = ref<undefined | string>(undefined)
const title = useTitle(targetRef)
expect(title.value).toEqual(undefined)
targetRef.value = 'new title'
expect(title.value).toEqual('new title')
title.value = 'latest title'
expect(title.value).toEqual('latest title')
})
})
})
describe('with readonly param', () => {
it('computed', () => {
const condition = ref(false)
const target = computed(() => condition.value ? 'new title' : 'old title')
const title = useTitle(target)
expect(title.value).toEqual('old title')
condition.value = true
expect(title.value).toEqual('new title')
// title.value = '' // typed error
})
it('function', () => {
const target = () => 'new title'
const title = useTitle(target)
expect(title.value).toEqual('new title')
// title.value = '' // typed error
})
})
})