query-selector-lite.spec.js

const fs = require('fs').promises;
const Document = require('./query-selector-lite');

describe('queryselectorlite', () => {
  const testCases = [
    {
      file: 'test.html',
      test: [
        { selector: 'h3', expect: 'tagTest' },
        { selector: '.abcdef', expect: 'classTest' },
        { selector: '.abcdef, .secondClass', expect: 'classTest' },
        { selector: '.not-found, .secondClass', expect: 'classTest' },
        { selector: '#testid', expect: 'idTest' },
        { selector: '.secondClass', expect: 'classTest' },
        { selector: '#testid', expect: 'idTest' },
        { selector: 'not-found', expect: null },
        { selector: '.not-found', expect: null },
        { selector: '#not-found', expect: null },
      ],
    },
  ];
  for (const testCase of testCases) {
    for (const test of testCase.test) {
      it(`should test querySelector ${test.selector} in file ${testCase.file}`, async () => {
        const doc = new Document();
        await doc.loadFile(testCase.file);
        const result = doc.querySelector(test.selector);
        expect(result ? result.innerText : null).toBe(test.expect);
      });
      it(`should test querySelectorAll ${test.selector} in file ${testCase.file}`, async () => {
        const doc = new Document();
        await doc.loadFile(testCase.file);
        const result = doc.querySelectorAll(test.selector)[0];
        expect(result ? result.innerText : null).toBe(test.expect);
      });
      it(`should test querySelectorAll ${test.selector} in file ${testCase.file} pre loaded`, async () => {
        const html = await (await fs.readFile(testCase.file)).toString();
        const doc = new Document(html);
        const result = doc.querySelectorAll(test.selector)[0];
        expect(result ? result.innerText : null).toBe(test.expect);
      });
    }
  }
  it('should properly use grouping selectrs', async () => {
    const doc = new Document();
    await doc.loadFile('test.html');
    const result = doc.querySelectorAll('div,h3');
    expect(result.length).toBe(5)
  });
});