EngineService: add unit tests

app/core/EngineService/EngineService.test.ts

@@ -0,0 +1,19 @@
+import configureMockStore from 'redux-mock-store';
+import EngineService from './EngineService';
+import Engine from '../Engine';
+import { store } from '../../store'
+
+jest.unmock('../Engine');
+
+describe('EngineService', () => {
+  EngineService.initalizeEngine(store);
+  it('should have Engine initialized', () => {
+    expect(Engine.context).toBeDefined();
+  });
+  it('should have recovered vault on redux store ', async () => {
+    const { success } = await EngineService.initializeVaultFromBackup();
+    expect(success).toBeTruthy();
+    const { KeyringController } = store.getState().engine.backgroundState;
+    expect(KeyringController.vault).toBeDefined();
+  });
+});

app/util/test/testSetup.js

@@ -115,7 +115,10 @@ jest.mock('react-native-keychain', () => ({
   setInternetCredentials: jest
     .fn(('server', 'username', 'password'))
     .mockResolvedValue({ service: 'metamask', storage: 'storage' }),
-  resetInternetCredentials: jest.fn(),
+  getInternetCredentials: jest
+    .fn()
+    .mockResolvedValue({ password: 'mock-credentials-password' }),
+  resetInternetCredentials: jest.fn().mockResolvedValue(),
   ACCESSIBLE: {
     WHEN_UNLOCKED: 'AccessibleWhenUnlocked',
     AFTER_FIRST_UNLOCK: 'AccessibleAfterFirstUnlock',