test.spec.js

const fs = require('fs');

//include custom matchers
const styleMatchers = require('jest-style-matchers');
expect.extend(styleMatchers);

describe('Source code is valid', () => {
  test('HTML validates without errors', async () => {
    const lintOpts = {
      'attr-bans':['align', 'background', 'bgcolor', 'border', 'frameborder', 'marginwidth', 'marginheight', 'scrolling', 'style', 'width', 'height'], //adding height, allow longdesc
      'tag-bans':['style','b'], //<i> allowed for font-awesome
      'doctype-first':true,
      'doctype-html5':true,
      'html-req-lang':true,
      'attr-name-style': false, //for meta tags
      'line-end-style':false, //either way
      'indent-style':false, //can mix/match
      'indent-width':false, //don't need to beautify
      'line-no-trailing-whitespace': false, //don't need to beautify
      'id-class-style':false, //I like dashes in classnames
      'id-class-no-ad': false, //stupid rule
      'img-req-alt':true,
      'link-req-noopener':false,
      'spec-char-escape':false, //for params in link urls

    }

    const htmlfiles = fs.readdirSync(__dirname).filter((f) => f.endsWith('.html'));
    for(let f of htmlfiles) {
      await expect(f).toHaveNoHtmlLintErrorsAsync(lintOpts);
    }
  })  

  test('CSS validates without errors', async () => {
    await expect('css/*.css').toHaveNoCssLintErrorsAsync(); //test all files in css folder
  })

  test('JavaScript lints without errors', () => {
    if(fs.existsSync(__dirname+'/js')) {
      const jsfiles = fs.readdirSync(__dirname+'/js').filter((f) => f.endsWith('.js'));

      for(let f of jsfiles) {
        expect(['js/'+f]).toHaveNoEsLintErrors();
      }
    }
  })
});