check-mobile.service.js

(function () {
  angular
    .module('myinfo.isMobile', [])
    .service('isMobile', isMobile);

  function isMobile () {
    const isMobile = {
      Android: () => {
        return navigator.userAgent.match(/Android/i) && navigator.userAgent.match(/wv/i);
      },
      iOS: () => {
        return navigator.userAgent.match(/iPhone|iPad|iPod/i);
      },
      any: () => {
        return (isMobile.Android() || isMobile.iOS());
      }
    };

    return isMobile;
  }

}());

check-mobile.service.Spec.js

'use strict';

describe('isMobile module', () => {
  let isMobile;

  beforeEach(module('myinfo.isMobile'));

  beforeEach(() => {
    const userAgent = 'Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1';
    module('myinfo.isMobile', $provide => {
      $provide.value('navigator', userAgent);
    });
  });

  beforeEach(inject((_isMobile_) => {
    isMobile = _isMobile_;
  }));

  describe('isMobile module testing', () => {
    it('isMobile.any should be defined', () => {
      expect(isMobile.any()).toBeDefined();
    });

    it('isMobile.Android should be defined', () => {
      expect(isMobile.Android()).toBeDefined();
    });

    it('isMobile.iOS should be defined', () => {
      expect(isMobile.iOS()).toBeDefined();
    });

    it('isMobile.iOS should be true', () => {
      expect(isMobile.iOS()).toEqual(true);
    });
  });
});