updated test suite and improve project structure

using constants for screen names now for avoiding mistakes.

package.json

@@ -10,12 +10,14 @@
     "test": "jest"
   },
   "dependencies": {
+    "lodash": "^4.17.4",
     "react": "16.2.0",
     "react-native": "0.51.0",
     "react-native-navigation": "^1.1.346"
   },
   "devDependencies": {
     "@types/jest": "^22.0.1",
+    "@types/lodash": "^4.14.93",
     "@types/react": "^16.0.34",
     "@types/react-native": "0.51.0",
     "@types/react-test-renderer": "^16.0.0",

src/App.ts

@@ -1,13 +1,16 @@
 import { Navigation } from 'react-native-navigation'
+
 import { registerScreens } from './screens'
+import { LANDING } from './screens/constants'
 
 // register all the screens
 registerScreens()
 
 // start the app
 Navigation.startSingleScreenApp({
   screen: {
-    screen: 'Landing',
-    title: 'Landing'
+    screen: LANDING
   }
-});
+})
+
+export default Navigation

src/__tests__/App.tsx

@@ -1,12 +1,11 @@
-// import 'react-native';
-// import * as React from 'react';
-// import * as renderer from 'react-test-renderer';
-// import {} from 'jest'
+import {} from 'jest'
+import * as _ from 'lodash'
+import { Navigation } from 'react-native-navigation'
 
-// import App from '../App';
+import App from '../App'
 
-// it('renders correctly', () => {
-//   const tree = renderer.create(
-//     <App />
-//   );
-// });
+describe('App', () => {
+  it('got a Navigation object', () => {
+    expect(_.isEqual(App, Navigation)).toBe(true)
+  })
+})

src/screens/Landing/__tests__/index.tsx

@@ -0,0 +1,14 @@
+import 'react-native';
+import * as React from 'react';
+import * as renderer from 'react-test-renderer';
+import {} from 'jest'
+
+import Landing from '../';
+
+describe('Landing Screen', () => {
+  it('renders correctly', () => {
+    const tree = renderer.create(
+      <Landing />
+    );
+  });
+})

src/screens/constants.ts

@@ -0,0 +1,2 @@
+// using constants for screen names for avoiding mistakes
+export const LANDING:string = 'Landing'

src/screens/index.ts

@@ -1,7 +1,8 @@
-import { Navigation } from 'react-native-navigation';
+import { Navigation } from 'react-native-navigation'
 
-import Landing from './Landing';
+import Landing from './Landing'
+import { LANDING } from './constants'
 
 export function registerScreens() {
-  Navigation.registerComponent('Landing', () => Landing);
-}
+  Navigation.registerComponent(LANDING, () => Landing)
+}

yarn.lock

@@ -14,6 +14,10 @@
   version "22.0.1"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-22.0.1.tgz#6370a6d60cce3845e4cd5d00bf65f654264685bc"
 
+"@types/lodash@^4.14.93":
+  version "4.14.93"
+  resolved "https://registry.yarnpkg.com/@types/lodash/-/lodash-4.14.93.tgz#a6d2a1e1601a3c29196f38ef1990b68a9afa1e1c"
+
 "@types/node@*":
   version "9.3.0"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-9.3.0.tgz#3a129cda7c4e5df2409702626892cb4b96546dd5"