RN Mock: push didAppear to next event loop (#7714)

This is needed to simulate real app life cycle where componentDidAppear is called after componentDidMount as per https://wix.github.io/react-native-navigation/docs/screen-lifecycle/#mounting

Co-authored-by: Yogev Ben David <[email protected]>

Author: doronpr

jest-setup.js

@@ -29,6 +29,8 @@ beforeEach(() => {
   mockUILib();
 });
 
+setImmediate = (callback) => callback();
+
 const mockUILib = () => {
   const NativeModules = require('react-native').NativeModules;
   NativeModules.KeyboardTrackingViewTempManager = {};

lib/Mock/Layouts/ComponentNode.ts

@@ -13,7 +13,7 @@ export default class ComponentNode extends ParentNode {
 
   public componentDidMount() {
     this.componentDidMountOnce = true;
-    this.componentDidAppearPending && this.componentDidAppear();
+    this.componentDidAppearPending && setImmediate(() => this.componentDidAppear());
   }
 
   public componentDidAppear() {