Exclude the testing build from non-experimental builds except at FB

Author: sebmarkbage

scripts/rollup/bundles.js

@@ -245,12 +245,13 @@ const bundles = [
     externals: ['react', 'react-dom'],
   },
 
-  // TODO: We don't use this bundle anymore
   /******* React DOM - www - Testing *******/
   {
     moduleType: RENDERER,
-    bundleTypes: [FB_WWW_DEV, FB_WWW_PROD, NODE_DEV, NODE_PROD],
-    entry: 'react-dom/testing',
+    bundleTypes: __EXPERIMENTAL__
+      ? [FB_WWW_DEV, FB_WWW_PROD]
+      : [FB_WWW_DEV, FB_WWW_PROD, NODE_DEV, NODE_PROD],
+    entry: 'react-dom/unstable_testing',
     global: 'ReactDOMTesting',
     minifyWithProdErrorCodes: true,
     wrapWithModuleBoundaries: false,