principles-ui-components/__tests__/CommonAPI-test.js

Supporting UI controller for Tizen TV web application, which developed base on React Framework.

import CommonAPI from '../UI_Component/common/CommonAPI';
//import {JSDOM} from 'jsdom';

//const { document } = (new JSDOM(`...`)).window;

describe('<CommonAPI />', () => {
  it('CommonAPI unit test, get right width', () => {
    const measure = jest.fn((data)=> { return ({width : 0}); });
    const getContext = jest.fn((type)=>{ return ({font:'', measureText: measure}); });
    const createElement = jest.fn((ty) => { return ({getContext: getContext}); } );

    document.createElement = createElement;
    
    let width = CommonAPI.getTextWidth('message',26,'SamsungOneGui_600');

    const createElement2 = jest.fn((ty) => { return ({getContext: jest.fn(() => {return null;})}); } );
    document.createElement = createElement2;
    width = CommonAPI.getTextWidth('message',26,'SamsungOneGui_600');
    
  });
});