Add tests for Auth screen

src/screens/Auth.js

@@ -9,7 +9,7 @@ import {
 } from '../redux/modules/settings';
 import { hashString } from '../utils/crypto';
 
-class Auth extends React.Component {
+export class Auth extends React.Component {
   static navigationOptions = {
     title: 'Passcode Auth',
   };

src/screens/Auth.test.js

@@ -0,0 +1,83 @@
+import React from 'react';
+
+import { Auth } from './Auth';
+
+describe('Auth screen test', () => {
+  it('should render as expected', () => {
+    const wrapper = shallow(<Auth />, {
+      disableLifecycleMethods: true,
+    });
+    expect(wrapper).toMatchSnapshot();
+  });
+
+  it('should redirect to Home route if passcode protection is off', () => {
+    const navMock = {
+      navigate: jest.fn(),
+      dispatch: jest.fn(),
+    };
+    const wrapper = shallow(
+      <Auth requirePasscode={false} navigation={navMock} />
+    );
+    expect(navMock.navigate.mock.calls.length).toBe(1);
+    expect(navMock.navigate.mock.calls[0][0]).toBe('Home');
+    expect(navMock.dispatch.mock.calls[0][0]).toEqual({
+      type: 'Navigation/RESET',
+      index: 0,
+      key: undefined,
+      actions: [{ type: 'Navigation/NAVIGATE', routeName: 'Home' }],
+    });
+  });
+
+  it('should not redirect to Home route if passcode protection is on', () => {
+    const navMock = {
+      navigate: jest.fn(),
+      dispatch: jest.fn(),
+    };
+    const wrapper = shallow(
+      <Auth requirePasscode={true} navigation={navMock} />
+    );
+    expect(navMock.navigate.mock.calls.length).toBe(0);
+  });
+
+  it('should throw an error if entered passcode is invalid and not redirect to Home', () => {
+    const navMock = {
+      navigate: jest.fn(),
+      dispatch: jest.fn(),
+    };
+    const wrapper = shallow(
+      <Auth
+        requirePasscode={true}
+        currentPasscode="5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8"
+        navigation={navMock}
+      />
+    );
+
+    wrapper.instance()._isPasscodeValid('notpassword');
+    expect(wrapper.state('error')).toEqual('Passcode Invalid!');
+    expect(navMock.navigate.mock.calls.length).toBe(0);
+  });
+
+  it('should redirect to Home if passcode entered is valid', () => {
+    const navMock = {
+      navigate: jest.fn(),
+      dispatch: jest.fn(),
+    };
+    const wrapper = shallow(
+      <Auth
+        requirePasscode={true}
+        currentPasscode="5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8"
+        navigation={navMock}
+      />
+    );
+    wrapper.instance()._isPasscodeValid('password');
+    expect(wrapper.state('error')).toEqual(null);
+    expect(navMock.navigate.mock.calls.length).toBe(1);
+    expect(navMock.navigate.mock.calls[0][0]).toBe('Home');
+    expect(navMock.dispatch.mock.calls[0][0]).toEqual({
+      type: 'Navigation/RESET',
+      index: 0,
+      key: undefined,
+      actions: [{ type: 'Navigation/NAVIGATE', routeName: 'Home' }],
+    });
+  });
+});

src/screens/__snapshots__/Auth.test.js.snap

@@ -0,0 +1,8 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Auth screen test should render as expected 1`] = `
+<PasscodeAuth
+  error={null}
+  handlePasscodeSubmit={[Function]}
+/>
+`;