__tests__/src/rules/lang-test.js

/**
 * @fileoverview Enforce lang attribute has a valid value.
 * @author Ethan Cohen
 */

// -----------------------------------------------------------------------------
// Requirements
// -----------------------------------------------------------------------------

import { RuleTester } from 'eslint';
import parserOptionsMapper from '../../__util__/parserOptionsMapper';
import parsers from '../../__util__/helpers/parsers';
import rule from '../../../src/rules/lang';

// -----------------------------------------------------------------------------
// Tests
// -----------------------------------------------------------------------------

const ruleTester = new RuleTester();

const expectedError = {
  message: 'lang attribute must have a valid value.',
  type: 'JSXAttribute',
};

const componentsSettings = {
  'jsx-a11y': {
    polymorphicPropName: 'as',
    components: {
      Foo: 'html',
    },
  },
};

ruleTester.run('lang', rule, {
  valid: parsers.all([].concat(
    { code: '<div />;' },
    { code: '<div foo="bar" />;' },
    { code: '<div lang="foo" />;' },
    { code: '<html lang="en" />' },
    { code: '<html lang="en-US" />' },
    { code: '<html lang="zh-Hans" />' },
    { code: '<html lang="zh-Hant-HK" />' },
    { code: '<html lang="zh-yue-Hant" />' },
    { code: '<html lang="ja-Latn" />' },
    { code: '<html lang={foo} />' },
    { code: '<HTML lang="foo" />' },
    { code: '<Foo lang={undefined} />' },
    { code: '<Foo lang="en" />', settings: componentsSettings },
    { code: '<Box as="html" lang="en"  />', settings: componentsSettings },
  )).map(parserOptionsMapper),
  invalid: parsers.all([].concat(
    { code: '<html lang="foo" />', errors: [expectedError] },
    { code: '<html lang="zz-LL" />', errors: [expectedError] },
    { code: '<html lang={undefined} />', errors: [expectedError] },
    { code: '<Foo lang={undefined} />', settings: componentsSettings, errors: [expectedError] },
    { code: '<Box as="html" lang="foo" />', settings: componentsSettings, errors: [expectedError] },
  )).map(parserOptionsMapper),
});