Ensure metadata test is not affected by other tests (#51973)

Turn out the `should error when id is missing in generateSitemaps` test
was passing because of this test passing: `should error when id is
missing in generateImageMetadata`

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---------

Co-authored-by: Jiachi Liu <inbox@huozhi.im>

packages/next/src/build/webpack/loaders/next-metadata-route-loader.ts

@@ -115,7 +115,7 @@ export async function GET(_, ctx) {
     id = imageMetadata.find((item) => {
       if (process.env.NODE_ENV !== 'production') {
         if (item?.id == null) {
-          throw new Error('id is required for every item returned from generateImageMetadata')
+          throw new Error('id property is required for every item returned from generateImageMetadata')
         }
       }
       return item.id.toString() === targetId

test/e2e/app-dir/metadata-dynamic-routes/index.test.ts

@@ -380,16 +380,26 @@ createNextDescribe(
           return new ImageResponse(<div>icon</div>)
         }
         `
+
+        const outputBeforeFetch = next.cliOutput + ''
+
         await next.patchFile(iconFilePath, contentMissingIdProperty)
         await next.fetch('/metadata-base/unset/icon/100')
-        await next.deleteFile(iconFilePath) // revert
 
-        await check(async () => {
-          expect(next.cliOutput).toContain(
-            `id is required for every item returned from generateImageMetadata`
-          )
-          return 'success'
-        }, /success/)
+        const outputAfterFetch = next.cliOutput + ''
+        const output = outputAfterFetch.replace(outputBeforeFetch, '')
+
+        try {
+          await check(async () => {
+            expect(output).toContain(
+              `id property is required for every item returned from generateImageMetadata`
+            )
+            return 'success'
+          }, /success/)
+        } finally {
+          await next.deleteFile(iconFilePath)
+          await next.fetch('/metadata-base/unset/icon/100')
+        }
       })
 
       it('should error when id is missing in generateSitemaps', async () => {
@@ -399,7 +409,7 @@ createNextDescribe(
 
         export async function generateSitemaps() {
           return [
-            { id: 0 },
+            { },
           ]
         }
 
@@ -411,16 +421,26 @@ createNextDescribe(
             },
           ]
         }`
+
+        const outputBeforeFetch = next.cliOutput + ''
+
         await next.patchFile(sitemapFilePath, contentMissingIdProperty)
         await next.fetch('/metadata-base/unset/sitemap.xml/0')
-        await next.deleteFile(sitemapFilePath) // revert
 
-        await check(async () => {
-          expect(next.cliOutput).toContain(
-            `id is required for every item returned from generateImageMetadata`
-          )
-          return 'success'
-        }, /success/)
+        const outputAfterFetch = next.cliOutput + ''
+        const output = outputAfterFetch.replace(outputBeforeFetch, '')
+
+        try {
+          await check(async () => {
+            expect(output).toContain(
+              `id property is required for every item returned from generateSitemaps`
+            )
+            return 'success'
+          }, /success/)
+        } finally {
+          await next.deleteFile(sitemapFilePath)
+          await next.fetch('/metadata-base/unset/sitemap.xml/0')
+        }
       })
     }