feat(test): add jest tests and mock file for library users (#140)

* feat: setup jest script
* feat: create jest.config file
* feat: create mocks to appevents and params
* feat: added jest to eslint
* feat: added test example inside readme
* feat: added spyOn example to Readme
* feat: added jest folder to package/json

README.md

@@ -661,6 +661,24 @@ yarn example:android
 Note: You'll probably want to change the Facebook App ID to your own, else the example app won't be able to login.  To change it, edit your local copy of `refresh-example.sh`, update the `FacebookAppId` variable, then re-run `refresh-example.sh` to regenerate the example directory.
 
 
+## Testing with Jest
+
+We have a example mock inside `jest/setup.js` but you just add the following line to your setup file:
+
+```js
+jest.mock('react-native-fbsdk-next', () => require('react-native-fbsdk-next/jest/mocks').default);
+```
+
+You also can spyOn one of this mock to return whatever you want inside your test:
+
+```js
+import { LoginManager } from 'react-native-fbsdk-next'
+
+jest.spyOn(LoginManager, 'logInWithPermissions').mockImplementation(() => Promise.resolve({ isCancelled: false }))
+
+```
+
+
 ## Join the React Native community
 
 - Website: https://facebook.github.io/react-native

jest.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  preset: 'react-native',
+  setupFiles: ['./jest/setup.js'],
+};

jest/mocks/index.js

@@ -0,0 +1,63 @@
+const nonMocked = require('../../lib/commonjs');
+
+export const mockAppEvents = {
+  AchievedLevel: 'fb_mobile_level_achieved',
+  AdClick: 'AdClick',
+  AdImpression: 'AdImpression',
+  AddedPaymentInfo: 'fb_mobile_add_payment_info',
+  AddedToCart: 'fb_mobile_add_to_cart',
+  AddedToWishlist: 'fb_mobile_add_to_wishlist',
+  CompletedRegistration: 'fb_mobile_complete_registration',
+  CompletedTutorial: 'fb_mobile_tutorial_completion',
+  Contact: 'Contact',
+  CustomizeProduct: 'CustomizeProduct',
+  Donate: 'Donate',
+  FindLocation: 'FindLocation',
+  InitiatedCheckout: 'fb_mobile_initiated_checkout',
+  Purchased: 'fb_mobile_purchase',
+  Rated: 'fb_mobile_rate',
+  Schedule: 'Schedule',
+  Searched: 'fb_mobile_search',
+  SpentCredits: 'fb_mobile_spent_credits',
+  StartTrial: 'StartTrial',
+  SubmitApplication: 'SubmitApplication',
+  Subscribe: 'Subscribe',
+  UnlockedAchievement: 'fb_mobile_achievement_unlocked',
+  ViewedContent: 'fb_mobile_content_view',
+};
+
+export const mockAppEventParams = {
+  AddType: 'ad_type',
+  Content: 'fb_content',
+  ContentID: 'fb_content_id',
+  ContentType: 'fb_content_type',
+  Currency: 'fb_currency',
+  Description: 'fb_description',
+  Level: 'fb_level',
+  MaxRatingValue: 'fb_max_rating_value',
+  NumItems: 'fb_num_items',
+  OrderId: 'fb_order_id',
+  PaymentInfoAvailable: 'fb_payment_info_available',
+  RegistrationMethod: 'fb_registration_method',
+  SearchString: 'fb_search_string',
+  Success: 'fb_success',
+  ValueNo: '0',
+  ValueYes: '1',
+};
+
+export default {
+  AppEventsLogger: {
+    logEvent: jest.fn(),
+    logPurchase: jest.fn(),
+    setUserID: jest.fn(),
+    AppEventParams: mockAppEventParams,
+    AppEvents: mockAppEvents,
+  },
+  LoginManager: {
+    logInWithPermissions: jest.fn(),
+  },
+  Settings: {
+    initializeSDK: jest.fn(),
+  },
+  LoginButton: nonMocked.LoginButton,
+};

jest/setup.js

@@ -0,0 +1,3 @@
+/* eslint-env jest */
+
+jest.mock('../src', () => require('./mocks').default);

package.json

@@ -52,7 +52,7 @@
     "prepare": "bob build",
     "flow": "flow",
     "lint": "eslint ./src",
-    "test": "yarn validate:prettier && yarn validate:eslint",
+    "test": "yarn validate:prettier && yarn validate:eslint && yarn jest",
     "validate:eslint": "eslint \"src/**/*\"",
     "validate:flow": "flow",
     "validate:prettier": "prettier \"src/**/*.js\" --check",
@@ -62,7 +62,8 @@
     "example:clean": "cd RNFBSDKExample && \\rm -fr yarn.lock node_modules ios/Podfile.lock && cd ..",
     "example:install": "cd RNFBSDKExample && yarn && cd ios && (pod install || true) && cd ../..",
     "example:devcopy": "yarn prepare && cp -rv android ios lib src types *.podspec RNFBSDKExample/node_modules/react-native-fbsdk-next/",
-    "semantic-release": "semantic-release"
+    "semantic-release": "semantic-release",
+    "jest": "jest"
   },
   "files": [
     "android/src/main/AndroidManifest.xml",
@@ -74,7 +75,8 @@
     "LICENSE.txt",
     "README.md",
     "react-native-fbsdk-next.podspec",
-    "types"
+    "types",
+    "jest"
   ],
   "dependencies": {},
   "peerDependencies": {