图片失败后继续加载阅读页并支持单图重试

tests/progressiveImages.test.mjs

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+import test from 'node:test'
+import assert from 'node:assert/strict'
+import {startImages, settleImage, retryImage} from '../src/utils/progressiveImages.js'
+
+test('a failed image does not prevent later pages from loading', () => {
+    const urls = ['first', 'second', 'third']
+    const items = startImages(urls)
+    settleImage(items, urls, items[0], true)
+    assert.equal(items[0].failed, true)
+    assert.equal(items[1].url, 'second')
+    settleImage(items, urls, items[1])
+    assert.equal(items[2].url, 'third')
+})
+
+test('retry does not append a duplicate page and bypasses a failed URL cache', () => {
+    const urls = ['first?gid=1', 'second', 'third']
+    const items = startImages(urls)
+    settleImage(items, urls, items[0], true)
+    retryImage(items[0])
+    assert.equal(items[0].src, 'first?gid=1&retry=1')
+    settleImage(items, urls, items[0])
+    assert.equal(items.length, 2)
+    assert.equal(items[0].failed, false)
+})
+
+test('late image events cannot append content after changing pages', () => {
+    const old = startImages(['old'])[0]
+    const urls = ['new', 'next']
+    const items = startImages(urls)
+    settleImage(items, urls, old)
+    assert.equal(items.length, 1)
+    assert.deepEqual(startImages([]), [])
+})