diff --git a/test/integration/image-optimizer/test/util.ts b/test/integration/image-optimizer/test/util.ts
index 255b9cdebc8e3..ef5ed4c8da42b 100644
--- a/test/integration/image-optimizer/test/util.ts
+++ b/test/integration/image-optimizer/test/util.ts
@@ -615,6 +615,57 @@ export function runTests(ctx) {
     // FIXME: await expectWidth(res, ctx.w)
   })
 
+  it('should resize gif (not animated)', async () => {
+    const query = { url: '/test.gif', w: ctx.w, q: 75 }
+    const opts = { headers: { accept: 'image/webp' } }
+    const res = await fetchViaHTTP(ctx.appPort, '/_next/image', query, opts)
+    expect(res.status).toBe(200)
+    expect(res.headers.get('Content-Type')).toBe('image/webp')
+    expect(res.headers.get('Cache-Control')).toBe(
+      `public, max-age=${isDev ? 0 : minimumCacheTTL}, must-revalidate`
+    )
+    expect(res.headers.get('Vary')).toBe('Accept')
+    expect(res.headers.get('etag')).toBeTruthy()
+    expect(res.headers.get('Content-Disposition')).toBe(
+      `${contentDispositionType}; filename="test.webp"`
+    )
+    await expectWidth(res, ctx.w)
+  })
+
+  it('should resize tiff', async () => {
+    const query = { url: '/test.tiff', w: ctx.w, q: 75 }
+    const opts = { headers: { accept: 'image/webp' } }
+    const res = await fetchViaHTTP(ctx.appPort, '/_next/image', query, opts)
+    expect(res.status).toBe(200)
+    expect(res.headers.get('Content-Type')).toBe('image/webp')
+    expect(res.headers.get('Cache-Control')).toBe(
+      `public, max-age=${isDev ? 0 : minimumCacheTTL}, must-revalidate`
+    )
+    expect(res.headers.get('Vary')).toBe('Accept')
+    expect(res.headers.get('etag')).toBeTruthy()
+    expect(res.headers.get('Content-Disposition')).toBe(
+      `${contentDispositionType}; filename="test.webp"`
+    )
+    await expectWidth(res, ctx.w)
+  })
+
+  it('should resize avif', async () => {
+    const query = { url: '/test.avif', w: ctx.w, q: 75 }
+    const opts = { headers: { accept: 'image/webp' } }
+    const res = await fetchViaHTTP(ctx.appPort, '/_next/image', query, opts)
+    expect(res.status).toBe(200)
+    expect(res.headers.get('Content-Type')).toBe('image/webp')
+    expect(res.headers.get('Cache-Control')).toBe(
+      `public, max-age=${isDev ? 0 : minimumCacheTTL}, must-revalidate`
+    )
+    expect(res.headers.get('Vary')).toBe('Accept')
+    expect(res.headers.get('etag')).toBeTruthy()
+    expect(res.headers.get('Content-Disposition')).toBe(
+      `${contentDispositionType}; filename="test.webp"`
+    )
+    await expectWidth(res, ctx.w)
+  })
+
   it('should resize relative url and old Chrome accept header as webp', async () => {
     const query = { url: '/test.png', w: ctx.w, q: 80 }
     const opts = {
@@ -656,6 +707,23 @@ export function runTests(ctx) {
       await expectWidth(res, ctx.w)
     })
 
+    it('should resize avif and maintain format', async () => {
+      const query = { url: '/test.avif', w: ctx.w, q: 75 }
+      const opts = { headers: { accept: 'image/avif' } }
+      const res = await fetchViaHTTP(ctx.appPort, '/_next/image', query, opts)
+      expect(res.status).toBe(200)
+      expect(res.headers.get('Content-Type')).toBe('image/avif')
+      expect(res.headers.get('Cache-Control')).toBe(
+        `public, max-age=${isDev ? 0 : minimumCacheTTL}, must-revalidate`
+      )
+      expect(res.headers.get('Vary')).toBe('Accept')
+      expect(res.headers.get('etag')).toBeTruthy()
+      expect(res.headers.get('Content-Disposition')).toBe(
+        `${contentDispositionType}; filename="test.avif"`
+      )
+      await expectWidth(res, ctx.w)
+    })
+
     it('should compress avif smaller than webp at q=100', async () => {
       await expectAvifSmallerThanWebp(ctx.w, 100, ctx.appPort)
     })