simplify console error expects

Author: salazarm

packages/react-dom/src/__tests__/ReactDOMServerPartialHydration-test.internal.js

@@ -508,7 +508,7 @@ describe('ReactDOMServerPartialHydration', () => {
       if (shouldSuspend) {
         throw promise;
       }
-      return <div />;
+      return <></>;
     }
 
     const finalHTML = ReactDOMServer.renderToString(<App hasB={true} />);
@@ -542,20 +542,14 @@ describe('ReactDOMServerPartialHydration', () => {
     }
 
     if (__DEV__) {
-      if (gate(flags => flags.enableClientRenderFallbackOnHydrationMismatch)) {
-        expect(console.error.calls.count()).toBe(2);
-        const errorArgs = console.error.calls.all().shift().args;
-        expect(errorArgs[0]).toContain(
-          'An error occurred during hydration. The server HTML was replaced with client content',
-        );
-      } else {
-        expect(console.error.calls.count()).toBe(1);
-      }
+      expect(console.error.calls.count()).toBe(1);
 
       const errorArgs = console.error.calls.all().pop().args;
       expect(errorArgs[0]).toBe(
         'Warning: Did not expect server HTML to contain a <%s> in <%s>.%s',
       );
+      expect(errorArgs[1]).toBe('span');
+      expect(errorArgs[2]).toBe('div');
     }
   });