test: add fuzzy testing

Author: harlan-zw

package.json

@@ -30,6 +30,7 @@
   "devDependencies": {
     "@antfu/eslint-config": "^4.10.1",
     "@arethetypeswrong/cli": "0.17.4",
+    "@fast-check/vitest": "^0.1.6",
     "@types/fs-extra": "^11.0.4",
     "@types/jsdom": "^21.1.7",
     "acorn-loose": "^8.4.0",

packages/unhead/test/unit/fuzz.test.ts

@@ -0,0 +1,34 @@
+import { fc, it } from '@fast-check/vitest'
+import { renderSSRHead } from '@unhead/ssr'
+import { useHead } from '../../src/composables'
+import { createHead } from '../../src/server'
+
+fc.configureGlobal({ numRuns: Number.POSITIVE_INFINITY })
+
+describe.runIf(process.env.FUZZY_TEST)('useHead', () => {
+  it('test', async () => {
+    const [a, b, c] = ['', '', { '': { toString: '' } }]
+    const head = createHead()
+    useHead(head, {
+      title: b,
+      link: [a, c],
+      meta: [{ a, b, c }, c],
+      style: a,
+      script: c,
+      c,
+    })
+    await renderSSRHead(head)
+  })
+  it.prop([fc.string(), fc.string(), fc.anything()])('breaks', async (a, b, c) => {
+    const head = createHead()
+    useHead(head, {
+      title: b,
+      link: [a, c],
+      meta: [{ a, b, c }, c],
+      style: a,
+      script: c,
+      c,
+    })
+    await renderSSRHead(head)
+  })
+})