Files
BoosAPI/desktop/libs/markstream-vue/test/mermaid-viewport-priority.test.ts
boos e0a5f57793 feat(desktop): embed BoosAPI Desktop client as a subproject
Vendor the rebranded BoosAPI Desktop client (Tauri + Vue) into metapi as
a monorepo subdirectory under desktop/. Source only — node_modules,
dist, Cargo target and the upstream .git history are excluded.

desktop/ keeps its own independent Cargo workspace (desktop/src-tauri
with crates/*); it is not part of the backend boosapi crate, so a
`cargo check` at the metapi root still compiles only the backend. Build
the desktop app from desktop/src-tauri per desktop/README.md.

Note: app icons are still placeholder assets pending the final BoosAPI
logo. The updater signing keys live outside the repo and are not
included.
2026-06-22 11:32:57 +08:00

112 lines
2.9 KiB
TypeScript

import { mount } from '@vue/test-utils'
import { afterEach, describe, expect, it, vi } from 'vitest'
import { nextTick } from 'vue'
interface Entry {
target: Element
isIntersecting: boolean
intersectionRatio: number
}
class FakeIntersectionObserver {
static instances: FakeIntersectionObserver[] = []
callback: (entries: Entry[]) => void
elements = new Set<Element>()
constructor(cb: (entries: Entry[]) => void) {
this.callback = cb
FakeIntersectionObserver.instances.push(this)
}
observe(el: Element) {
this.elements.add(el)
}
unobserve(el: Element) {
this.elements.delete(el)
}
disconnect() {
this.elements.clear()
}
trigger(el: Element, isIntersecting = true) {
if (!this.elements.has(el))
return
this.callback([{ target: el, isIntersecting, intersectionRatio: isIntersecting ? 1 : 0 }])
}
}
async function flushVueUpdates() {
await nextTick()
await Promise.resolve()
await Promise.resolve()
}
afterEach(() => {
vi.useRealTimers()
vi.unstubAllGlobals()
vi.resetModules()
FakeIntersectionObserver.instances = []
})
describe('mermaid viewport priority', () => {
it('prerenders during idle before the block becomes visible', async () => {
vi.useFakeTimers()
vi.stubGlobal('requestIdleCallback', ((cb: any) => setTimeout(() => cb({ didTimeout: false, timeRemaining: () => 50 }), 1)) as any)
vi.stubGlobal('cancelIdleCallback', ((id: number) => clearTimeout(id)) as any)
const canParseOffthread = vi.fn(async () => true)
const findPrefixOffthread = vi.fn(async () => null)
vi.doMock('../src/workers/mermaidWorkerClient', () => ({
canParseOffthread,
findPrefixOffthread,
terminateWorker: vi.fn(),
}))
vi.stubGlobal('IntersectionObserver', FakeIntersectionObserver as any)
const MermaidBlockNode = (await import('../src/components/MermaidBlockNode/MermaidBlockNode.vue')).default
const node = {
type: 'code_block',
language: 'mermaid',
code: 'graph LR\nA-->B\n',
raw: '```mermaid\ngraph LR\nA-->B\n```',
}
const wrapper = mount(MermaidBlockNode as any, {
props: {
node,
loading: true,
},
})
await flushVueUpdates()
;(wrapper.vm as any).mermaidAvailable = true
;(wrapper.vm as any).showSource = false
await flushVueUpdates()
await wrapper.setProps({
node: {
...node,
code: 'graph LR\nA-->B\nB-->C\n',
raw: '```mermaid\ngraph LR\nA-->B\nB-->C\n```',
},
})
await flushVueUpdates()
await vi.advanceTimersByTimeAsync(250)
await flushVueUpdates()
expect(canParseOffthread).not.toHaveBeenCalled()
expect(findPrefixOffthread).not.toHaveBeenCalled()
const observer = FakeIntersectionObserver.instances.at(-1)
expect(observer).toBeTruthy()
await vi.advanceTimersByTimeAsync(1200)
await flushVueUpdates()
expect(canParseOffthread).toHaveBeenCalled()
})
})