cheke/__tests__/messages/notEmailMessage.test.js

Express request validator with object's style response body and inspired by Laravel's Validator

const notEmail = require('../../src/messages/notEmailMessage');

describe('not-an-email-message', () => {
  test('should return The email must be a valid email address.', () => {
    expect(notEmail('email')).toBe('The email must be a valid email address.');
  });
});