Enable RTR create warning

packages/shared/ReactFeatureFlags.js

@@ -190,10 +190,8 @@ export const enableInfiniteRenderLoopDetection = true;
 export const enableRefAsProp = __NEXT_MAJOR__;
 export const disableStringRefs = __NEXT_MAJOR__;
 
-// Not ready to break experimental yet.
-// Needs more internal cleanup
 // Warn on any usage of ReactTestRenderer
-export const enableReactTestRendererWarning = false;
+export const enableReactTestRendererWarning = __NEXT_MAJOR__;
 
 // Disables legacy mode
 // This allows us to land breaking changes to remove legacy mode APIs in experimental builds

packages/shared/forks/ReactFeatureFlags.test-renderer.js

@@ -99,9 +99,9 @@ export const enableInfiniteRenderLoopDetection = false;
 const __NEXT_MAJOR__ = __EXPERIMENTAL__;
 export const enableRefAsProp = __NEXT_MAJOR__;
 export const disableStringRefs = __NEXT_MAJOR__;
-export const enableReactTestRendererWarning = false;
 export const enableBigIntSupport = __NEXT_MAJOR__;
 export const disableLegacyMode = __NEXT_MAJOR__;
+export const enableReactTestRendererWarning = __NEXT_MAJOR__;
 
 // Flow magic to verify the exports of this file match the original version.
 ((((null: any): ExportsType): FeatureFlagsType): ExportsType);

scripts/jest/setupTests.js

@@ -3,6 +3,7 @@
 const chalk = require('chalk');
 const util = require('util');
 const shouldIgnoreConsoleError = require('./shouldIgnoreConsoleError');
+const shouldIgnoreConsoleWarn = require('./shouldIgnoreConsoleWarn');
 const {getTestFlags} = require('./TestFlags');
 
 if (process.env.REACT_CLASS_EQUIVALENCE_TEST) {
@@ -71,6 +72,11 @@ if (process.env.REACT_CLASS_EQUIVALENCE_TEST) {
         return;
       }
 
+      // Ignore certain React warnings causing test failures
+      if (methodName === 'warn' && shouldIgnoreConsoleWarn(format)) {
+        return;
+      }
+
       // Capture the call stack now so we can warn about it later.
       // The call stack has helpful information for the test author.
       // Don't throw yet though b'c it might be accidentally caught and suppressed.

scripts/jest/shouldIgnoreConsoleWarn.js

@@ -0,0 +1,11 @@
+'use strict';
+
+module.exports = function shouldIgnoreConsoleWarn(format) {
+  if (typeof format === 'string') {
+    if (format.indexOf('Warning: react-test-renderer is deprecated.') === 0) {
+      return true;
+    }
+  }
+
+  return false;
+};