Add tests for searchParams dev warning (#16798)

Fixes a warning being logged to the console when using `href` with a dynamic path. Fixes #16794

test/integration/dynamic-routing/pages/d/[id].js

+import { useRouter } from 'next/router'
+
+const Page = () => {
+  const router = useRouter()
+  const { query } = router
+  return <p id="asdf">This is {query.id}</p>
+}
+
+export default Page

test/integration/dynamic-routing/pages/index.js

 import Link from 'next/link'
 import { useRouter } from 'next/router'
 
+if (typeof window !== 'undefined') {
+  window.caughtWarns = []
+  const origWarn = window.console.warn
+  window.console.warn = function (...args) {
+    window.caughtWarns.push(args)
+    origWarn(...args)
+  }
+}
+
 const Page = () => {
   return (
     <div>
@@ -128,6 +137,9 @@ const Page = () => {
         <a id="nested-ssg-catch-all-multi">Nested Catch-all route (multi)</a>
       </Link>
       <br />
+      <Link href="/d/dynamic-1">
+        <a id="dynamic-route-no-as">Dynamic route no as</a>
+      </Link>
       <p id="query">{JSON.stringify(Object.keys(useRouter().query))}</p>
     </div>
   )

test/integration/dynamic-routing/test/index.test.js

@@ -84,6 +84,31 @@ function runTests(dev) {
     expect(url).toBe('?fromHome=true')
   })
 
+  if (dev) {
+    it('should not have any console warnings on initial load', async () => {
+      const browser = await webdriver(appPort, '/')
+      expect(await browser.eval('window.caughtWarns')).toEqual([])
+    })
+
+    it('should not have any console warnings when navigating to dynamic route', async () => {
+      let browser
+      try {
+        browser = await webdriver(appPort, '/')
+        await browser.eval('window.beforeNav = 1')
+        await browser.elementByCss('#dynamic-route-no-as').click()
+        await browser.waitForElementByCss('#asdf')
+
+        expect(await browser.eval('window.beforeNav')).toBe(1)
+
+        const text = await browser.elementByCss('#asdf').text()
+        expect(text).toMatch(/this is.*?dynamic-1/i)
+        expect(await browser.eval('window.caughtWarns')).toEqual([])
+      } finally {
+        if (browser) await browser.close()
+      }
+    })
+  }
+
   it('should navigate to a dynamic page successfully', async () => {
     let browser
     try {
@@ -893,6 +918,14 @@ function runTests(dev) {
               helloworld: 'hello-world',
             },
           },
+          {
+            namedRegex: '^/d/(?<id>[^/]+?)(?:/)?$',
+            page: '/d/[id]',
+            regex: normalizeRegEx('^\\/d\\/([^\\/]+?)(?:\\/)?$'),
+            routeKeys: {
+              id: 'id',
+            },
+          },
           {
             namedRegex: '^/dash/(?<helloworld>[^/]+?)(?:/)?$',
             page: '/dash/[hello-world]',