facebook
diff --git a/‎packages/react-native-renderer/src/__tests__/ReactFabricAndNative-test.internal.js‎
Lines changed: 62 additions & 1 deletion b/‎packages/react-native-renderer/src/__tests__/ReactFabricAndNative-test.internal.js‎
Lines changed: 62 additions & 1 deletion
diff --git a/‎packages/react-native-renderer/src/__tests__/ReactNativeAndFabric-test.internal.js‎
Lines changed: 0 additions & 78 deletions b/‎packages/react-native-renderer/src/__tests__/ReactNativeAndFabric-test.internal.js‎
Lines changed: 0 additions & 78 deletions
@@ -16,7 +16,7 @@ let ReactNative;
 let UIManager;
 let createReactNativeComponentClass;
 
-describe('ReactFabric', () => {
+describe('created with ReactFabric called with ReactNative', () => {
   beforeEach(() => {
     jest.resetModules();
     require('react-native/Libraries/ReactPrivate/InitializeNativeFabricUIManager');
@@ -75,3 +75,64 @@ describe('ReactFabric', () => {
     expect(UIManager.dispatchViewManagerCommand).not.toBeCalled();
   });
 });
+
+describe('created with ReactNative called with ReactFabric', () => {
+  beforeEach(() => {
+    jest.resetModules();
+    require('react-native/Libraries/ReactPrivate/InitializeNativeFabricUIManager');
+    ReactFabric = require('react-native-renderer/fabric');
+    jest.resetModules();
+    UIManager = require('react-native/Libraries/ReactPrivate/ReactNativePrivateInterface')
+      .UIManager;
+    jest.mock('shared/ReactFeatureFlags', () =>
+      require('shared/forks/ReactFeatureFlags.native-oss'),
+    );
+    ReactNative = require('react-native-renderer');
+
+    React = require('react');
+    createReactNativeComponentClass = require('react-native/Libraries/ReactPrivate/ReactNativePrivateInterface')
+      .ReactNativeViewConfigRegistry.register;
+  });
+
+  it('find Paper nodes with the Fabric renderer', () => {
+    const View = createReactNativeComponentClass('RCTView', () => ({
+      validAttributes: {title: true},
+      uiViewClassName: 'RCTView',
+    }));
+
+    let ref = React.createRef();
+
+    class Component extends React.Component {
+      render() {
+        return <View title="foo" />;
+      }
+    }
+
+    ReactNative.render(<Component ref={ref} />, 11);
+
+    let handle = ReactFabric.findNodeHandle(ref.current);
+    expect(handle).toBe(3);
+  });
+
+  it('dispatches commands on Paper nodes with the Fabric renderer', () => {
+    UIManager.dispatchViewManagerCommand.mockReset();
+    const View = createReactNativeComponentClass('RCTView', () => ({
+      validAttributes: {title: true},
+      uiViewClassName: 'RCTView',
+    }));
+
+    let ref = React.createRef();
+
+    ReactNative.render(<View title="bar" ref={ref} />, 11);
+    expect(UIManager.dispatchViewManagerCommand).not.toBeCalled();
+    ReactFabric.dispatchCommand(ref.current, 'myCommand', [10, 20]);
+    expect(UIManager.dispatchViewManagerCommand).toHaveBeenCalledTimes(1);
+    expect(UIManager.dispatchViewManagerCommand).toHaveBeenCalledWith(
+      expect.any(Number),
+      'myCommand',
+      [10, 20],
+    );
+
+    expect(nativeFabricUIManager.dispatchCommand).not.toBeCalled();
+  });
+});