Phase7-PerfSEO: 폰트 preload 옵션 및 이미지 loading/decoding UI 연동 TDD/구현 완료

lib/exporter/image.loading.toggle.test.ts

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+import { describe, it, expect } from 'vitest'
+import { exportPage, type ExportOptions } from '@/lib/exporter/html'
+import { pageSchema, type Page } from '@/lib/schema/page'
+
+function makePage(): Page {
+  return pageSchema.parse({
+    title: 'Img Perf',
+    locale: 'en',
+    theme: { primaryColor: '#2563eb', fontFamily: 'Inter' },
+    sections: [ { type: 'hero', props: { heading: 'Hello', subheading: 'World', imageUrl: 'https://img/h.png' } } ],
+    form: { actionUrl: '', fields: [], spamProtection: { honeypotFieldName: '_hp', minSubmitSeconds: 2 } },
+    seo: { title: 't', description: 'd' },
+  })
+}
+
+describe('이미지 loading/decoding 토글', () => {
+  it('기본은 loading="lazy", decoding="async"', () => {
+    const page = makePage()
+    const out = exportPage(page)
+    expect(out.html).toContain('loading="lazy"')
+    expect(out.html).toContain('decoding="async"')
+  })
+
+  it('옵션으로 eager/sync로 바꿀 수 있다', () => {
+    const page = makePage()
+    const opts: ExportOptions = { imageLoading: 'eager', imageDecoding: 'sync' }
+    const out = exportPage(page, opts)
+    expect(out.html).toContain('loading="eager"')
+    expect(out.html).toContain('decoding="sync"')
+  })
+})