Defer profile featured artworks

2026-08-29 16:33:36 +02:00
parent ff80f5bf97
commit 872f420190
7 changed files with 336 additions and 39 deletions
@@ -0,0 +1,77 @@
+import React from 'react'
+import { act, render, screen, waitFor } from '@testing-library/react'
+import { describe, expect, it, vi, beforeEach, afterEach } from 'vitest'
+import useLazyProfileFeaturedArtworks from './useLazyProfileFeaturedArtworks'
+
+function Harness({ username = 'alice', initial = null, enabled = false }) {
+  const state = useLazyProfileFeaturedArtworks({
+    username,
+    initialFeaturedArtworks: initial,
+    enabled,
+  })
+
+  return (
+    <div>
+      <span data-testid="count">{state.items.length}</span>
+      <span data-testid="loading">{String(state.loading)}</span>
+      <span data-testid="error">{String(state.error)}</span>
+      <button type="button" onClick={state.retry}>retry</button>
+      {state.items.map((item) => <span key={item.id}>{item.title}</span>)}
+    </div>
+  )
+}
+
+describe('useLazyProfileFeaturedArtworks', () => {
+  beforeEach(() => {
+    vi.stubGlobal('fetch', vi.fn(async () => ({
+      ok: true,
+      json: async () => ({ data: [{ id: 1, title: 'Featured one' }] }),
+    })))
+  })
+
+  afterEach(() => vi.unstubAllGlobals())
+
+  it('does not request while the posts tab is active', () => {
+    render(<Harness />)
+    expect(fetch).not.toHaveBeenCalled()
+  })
+
+  it('loads once on first artworks activation and reuses the result', async () => {
+    const view = render(<Harness enabled />)
+
+    await waitFor(() => expect(screen.getByText('Featured one')).toBeTruthy())
+    expect(fetch).toHaveBeenCalledTimes(1)
+
+    view.rerender(<Harness enabled={false} />)
+    view.rerender(<Harness enabled />)
+    expect(fetch).toHaveBeenCalledTimes(1)
+  })
+
+  it('does not request when SSR already supplied featured artworks', () => {
+    render(<Harness enabled initial={[{ id: 9, title: 'SSR feature' }]} />)
+    expect(screen.getByText('SSR feature')).toBeTruthy()
+    expect(fetch).not.toHaveBeenCalled()
+  })
+
+  it('allows a safe retry after failure', async () => {
+    fetch.mockRejectedValueOnce(new Error('network'))
+    render(<Harness enabled />)
+
+    await waitFor(() => expect(screen.getByTestId('error').textContent).toBe('true'))
+    await act(async () => screen.getByRole('button', { name: 'retry' }).click())
+    await waitFor(() => expect(screen.getByText('Featured one')).toBeTruthy())
+    expect(fetch).toHaveBeenCalledTimes(2)
+  })
+
+  it('ignores a stale response after profile navigation', async () => {
+    let resolveAlice
+    fetch.mockImplementationOnce(() => new Promise((resolve) => { resolveAlice = resolve }))
+    const view = render(<Harness username="alice" enabled />)
+
+    view.rerender(<Harness username="bob" enabled={false} />)
+    await act(async () => resolveAlice({ ok: true, json: async () => ({ data: [{ id: 1, title: 'Alice feature' }] }) }))
+
+    expect(screen.queryByText('Alice feature')).toBeNull()
+    expect(screen.getByTestId('count').textContent).toBe('0')
+  })
+})