Fix tests for www

Author: Sebastian Silbermann

packages/react-dom/src/__tests__/ReactRenderDocument-test.js

@@ -265,6 +265,9 @@ describe('rendering React components at document', () => {
       );
       const testDocument = getTestDocument(markup);
 
+      const enableClientRenderFallbackOnTextMismatch = gate(
+        flags => flags.enableClientRenderFallbackOnTextMismatch,
+      );
       expect(() => {
         ReactDOM.flushSync(() => {
           ReactDOMClient.hydrateRoot(
@@ -278,17 +281,25 @@ describe('rendering React components at document', () => {
           );
         });
       }).toErrorDev(
-        [
-          'Warning: An error occurred during hydration. The server HTML was replaced with client content in <#document>.',
-          'Warning: Text content did not match.',
-        ],
-        {withoutStack: 1},
+        enableClientRenderFallbackOnTextMismatch
+          ? [
+              'Warning: An error occurred during hydration. The server HTML was replaced with client content in <#document>.',
+              'Warning: Text content did not match.',
+            ]
+          : ['Warning: Text content did not match.'],
+        {
+          withoutStack: enableClientRenderFallbackOnTextMismatch ? 1 : 0,
+        },
       );
 
-      assertLog([
-        'Log recoverable error: Text content does not match server-rendered HTML.',
-        'Log recoverable error: There was an error while hydrating. Because the error happened outside of a Suspense boundary, the entire root will switch to client rendering.',
-      ]);
+      assertLog(
+        enableClientRenderFallbackOnTextMismatch
+          ? [
+              'Log recoverable error: Text content does not match server-rendered HTML.',
+              'Log recoverable error: There was an error while hydrating. Because the error happened outside of a Suspense boundary, the entire root will switch to client rendering.',
+            ]
+          : [],
+      );
       expect(testDocument.body.innerHTML).toBe('Hello world');
     });