Ability to Set Device Model for Unit Tests

[joncursi]

This library is great! I've started using ternary expressions such as Device.isIpad() ? a : b throughout my code. But now I'm at a point where I'd like to test it (I am using Enzyme to unit test my entire app).

Therefore, it would be great if this library supplied a setDevice method that can be invoked before the tests run. Otherwise, as it currently stands, Device.model is evaluated as undefined in all tests, so these ternary expressions are untestable.

[joncursi]

For those interested, this is my current workaround:

// mocha setup.js

import mockery from 'mockery';

global.Device = {
  model: 'iPhone', // use iPhone as the default
};

mockery.registerMock('react-native-device', {
  isIpad() {
    return global.Device.model === 'iPad';
  },
  isIphone() {
    return global.Device.model === 'iPhone';
  },
});

// test file

it('does something on iPad', function () {
  global.Device.model = 'iPad'; // change Device model before running iPad test
  expect(something).toEqual(something);
  global.Device.model = 'iPhone'; // reset Device model to iPhone before terminating the test
});