scripts/eslint_rules/tests/lit_html_host_this_test.js

// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
'use strict';

const rule = require('../lib/lit_html_host_this.js');
const ruleTester = new (require('eslint').RuleTester)({
  parserOptions: {ecmaVersion: 9, sourceType: 'module'},
  parser: require.resolve('@typescript-eslint/parser'),
});

ruleTester.run('lit_html_host_this', rule, {
  valid: [
    {
      code: 'LitHtml.render(someHtml, this.shadow, {host: this})',
      filename: 'front_end/components/datagrid.ts',
    },
    {
      code: 'NotLitHtmlButSimilar.render(foo, bar)',
      filename: 'front_end/components/datagrid.ts',
    },
  ],
  invalid: [
    {
      code: 'LitHtml.render(someHtml, this.shadow)',
      filename: 'front_end/components/datagrid.ts',
      errors: [{messageId: 'missingHostOption'}],
      output: 'LitHtml.render(someHtml, this.shadow, {host: this})'
    },
    {
      code: 'LitHtml.render(someHtml, this.shadow, { renderBefore: foo })',
      filename: 'front_end/components/datagrid.ts',
      errors: [{messageId: 'missingHostOption'}],
      output: 'LitHtml.render(someHtml, this.shadow, { renderBefore: foo, host: this })',
    },
    {
      code: 'LitHtml.render(someHtml, this.shadow, { renderBefore: foo, })',
      filename: 'front_end/components/datagrid.ts',
      errors: [{messageId: 'missingHostOption'}],
      output: 'LitHtml.render(someHtml, this.shadow, { renderBefore: foo, host: this, })',
    },
    {
      code: 'LitHtml.render(someHtml, this.shadow, { host: notThis })',
      filename: 'front_end/components/datagrid.ts',
      errors: [{messageId: 'invalidHostOption'}]
    },
  ]
});