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rendererFragment.spec.ts
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rendererFragment.spec.ts
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import {
h,
createVNode,
render,
nodeOps,
NodeTypes,
TestElement,
Fragment,
resetOps,
dumpOps,
NodeOpTypes,
serializeInner,
createTextVNode,
createBlock,
openBlock,
createCommentVNode
} from '@vue/runtime-test'
import { PatchFlags } from '@vue/shared'
import { renderList } from '../src/helpers/renderList'
describe('renderer: fragment', () => {
it('should allow returning multiple component root nodes', () => {
const App = {
render() {
return [h('div', 'one'), 'two']
}
}
const root = nodeOps.createElement('div')
render(h(App), root)
expect(serializeInner(root)).toBe(`<div>one</div>two`)
expect(root.children.length).toBe(4)
expect(root.children[0]).toMatchObject({
type: NodeTypes.TEXT,
text: ''
})
expect(root.children[1]).toMatchObject({
type: NodeTypes.ELEMENT,
tag: 'div'
})
expect((root.children[1] as TestElement).children[0]).toMatchObject({
type: NodeTypes.TEXT,
text: 'one'
})
expect(root.children[2]).toMatchObject({
type: NodeTypes.TEXT,
text: 'two'
})
expect(root.children[3]).toMatchObject({
type: NodeTypes.TEXT,
text: ''
})
})
it('explicitly create fragments', () => {
const root = nodeOps.createElement('div')
render(h('div', [h(Fragment, [h('div', 'one'), 'two'])]), root)
const parent = root.children[0] as TestElement
expect(serializeInner(parent)).toBe(`<div>one</div>two`)
})
it('patch fragment children (manual, keyed)', () => {
const root = nodeOps.createElement('div')
render(
h(Fragment, [h('div', { key: 1 }, 'one'), h('div', { key: 2 }, 'two')]),
root
)
expect(serializeInner(root)).toBe(`<div>one</div><div>two</div>`)
resetOps()
render(
h(Fragment, [h('div', { key: 2 }, 'two'), h('div', { key: 1 }, 'one')]),
root
)
expect(serializeInner(root)).toBe(`<div>two</div><div>one</div>`)
const ops = dumpOps()
// should be moving nodes instead of re-creating or patching them
expect(ops).toMatchObject([
{
type: NodeOpTypes.INSERT
}
])
})
it('patch fragment children (manual, unkeyed)', () => {
const root = nodeOps.createElement('div')
render(h(Fragment, [h('div', 'one'), h('div', 'two')]), root)
expect(serializeInner(root)).toBe(`<div>one</div><div>two</div>`)
resetOps()
render(h(Fragment, [h('div', 'two'), h('div', 'one')]), root)
expect(serializeInner(root)).toBe(`<div>two</div><div>one</div>`)
const ops = dumpOps()
// should be patching nodes instead of moving or re-creating them
expect(ops).toMatchObject([
{
type: NodeOpTypes.SET_ELEMENT_TEXT
},
{
type: NodeOpTypes.SET_ELEMENT_TEXT
}
])
})
it('patch fragment children (compiler generated, unkeyed)', () => {
const root = nodeOps.createElement('div')
render(
createVNode(
Fragment,
null,
[
createVNode('div', null, 'one', PatchFlags.TEXT),
createTextVNode('two')
],
PatchFlags.UNKEYED_FRAGMENT
),
root
)
expect(serializeInner(root)).toBe(`<div>one</div>two`)
render(
createVNode(
Fragment,
null,
[
createVNode('div', null, 'foo', PatchFlags.TEXT),
createTextVNode('bar'),
createTextVNode('baz')
],
PatchFlags.UNKEYED_FRAGMENT
),
root
)
expect(serializeInner(root)).toBe(`<div>foo</div>barbaz`)
render(
createVNode(
Fragment,
null,
[
createTextVNode('baz'),
createVNode('div', null, 'foo', PatchFlags.TEXT)
],
PatchFlags.UNKEYED_FRAGMENT
),
root
)
expect(serializeInner(root)).toBe(`baz<div>foo</div>`)
})
it('patch fragment children (compiler generated, keyed)', () => {
const root = nodeOps.createElement('div')
render(
createVNode(
Fragment,
null,
[h('div', { key: 1 }, 'one'), h('div', { key: 2 }, 'two')],
PatchFlags.KEYED_FRAGMENT
),
root
)
expect(serializeInner(root)).toBe(`<div>one</div><div>two</div>`)
resetOps()
render(
createVNode(
Fragment,
null,
[h('div', { key: 2 }, 'two'), h('div', { key: 1 }, 'one')],
PatchFlags.KEYED_FRAGMENT
),
root
)
expect(serializeInner(root)).toBe(`<div>two</div><div>one</div>`)
const ops = dumpOps()
// should be moving nodes instead of re-creating or patching them
expect(ops).toMatchObject([
{
type: NodeOpTypes.INSERT
}
])
})
it('move fragment', () => {
const root = nodeOps.createElement('div')
render(
h('div', [
h('div', { key: 1 }, 'outer'),
h(Fragment, { key: 2 }, [
h('div', { key: 1 }, 'one'),
h('div', { key: 2 }, 'two')
])
]),
root
)
expect(serializeInner(root)).toBe(
`<div><div>outer</div><div>one</div><div>two</div></div>`
)
resetOps()
render(
h('div', [
h(Fragment, { key: 2 }, [
h('div', { key: 2 }, 'two'),
h('div', { key: 1 }, 'one')
]),
h('div', { key: 1 }, 'outer')
]),
root
)
expect(serializeInner(root)).toBe(
`<div><div>two</div><div>one</div><div>outer</div></div>`
)
const ops = dumpOps()
// should be moving nodes instead of re-creating them
expect(ops).toMatchObject([
// 1. re-order inside the fragment
{ type: NodeOpTypes.INSERT, targetNode: { type: 'element' } },
// 2. move entire fragment, including anchors
// not the most efficient move, but this case is super rare
// and optimizing for this special case complicates the algo quite a bit
{ type: NodeOpTypes.INSERT, targetNode: { type: 'text', text: '' } },
{ type: NodeOpTypes.INSERT, targetNode: { type: 'element' } },
{ type: NodeOpTypes.INSERT, targetNode: { type: 'element' } },
{ type: NodeOpTypes.INSERT, targetNode: { type: 'text', text: '' } }
])
})
it('handle nested fragments', () => {
const root = nodeOps.createElement('div')
render(
h(Fragment, [
h('div', { key: 1 }, 'outer'),
h(Fragment, { key: 2 }, [
h('div', { key: 1 }, 'one'),
h('div', { key: 2 }, 'two')
])
]),
root
)
expect(serializeInner(root)).toBe(
`<div>outer</div><div>one</div><div>two</div>`
)
resetOps()
render(
h(Fragment, [
h(Fragment, { key: 2 }, [
h('div', { key: 2 }, 'two'),
h('div', { key: 1 }, 'one')
]),
h('div', { key: 1 }, 'outer')
]),
root
)
expect(serializeInner(root)).toBe(
`<div>two</div><div>one</div><div>outer</div>`
)
const ops = dumpOps()
// should be moving nodes instead of re-creating them
expect(ops).toMatchObject([
{ type: NodeOpTypes.INSERT, targetNode: { type: 'element' } },
{ type: NodeOpTypes.INSERT, targetNode: { type: 'text', text: '' } },
{ type: NodeOpTypes.INSERT, targetNode: { type: 'element' } },
{ type: NodeOpTypes.INSERT, targetNode: { type: 'element' } },
{ type: NodeOpTypes.INSERT, targetNode: { type: 'text', text: '' } }
])
// should properly remove nested fragments
render(null, root)
expect(serializeInner(root)).toBe(``)
})
// #2080
test('`template` keyed fragment w/ comment + hoisted node', () => {
const root = nodeOps.createElement('div')
const hoisted = h('span')
const renderFn = (items: string[]) => {
return (
openBlock(true),
createBlock(
Fragment,
null,
renderList(items, item => {
return (
openBlock(),
createBlock(
Fragment,
{ key: item },
[
createCommentVNode('comment'),
hoisted,
createVNode('div', null, item, PatchFlags.TEXT)
],
PatchFlags.STABLE_FRAGMENT
)
)
}),
PatchFlags.KEYED_FRAGMENT
)
)
}
render(renderFn(['one', 'two']), root)
expect(serializeInner(root)).toBe(
`<!--comment--><span></span><div>one</div><!--comment--><span></span><div>two</div>`
)
render(renderFn(['two', 'one']), root)
expect(serializeInner(root)).toBe(
`<!--comment--><span></span><div>two</div><!--comment--><span></span><div>one</div>`
)
})
// #6852
test('`template` keyed fragment w/ text', () => {
const root = nodeOps.createElement('div')
const renderFn = (items: string[]) => {
return (
openBlock(true),
createBlock(
Fragment,
null,
renderList(items, item => {
return (
openBlock(),
createBlock(
Fragment,
{ key: item },
[
createTextVNode('text'),
createVNode('div', null, item, PatchFlags.TEXT)
],
PatchFlags.STABLE_FRAGMENT
)
)
}),
PatchFlags.KEYED_FRAGMENT
)
)
}
render(renderFn(['one', 'two']), root)
expect(serializeInner(root)).toBe(`text<div>one</div>text<div>two</div>`)
render(renderFn(['two', 'one']), root)
expect(serializeInner(root)).toBe(`text<div>two</div>text<div>one</div>`)
})
})