How to use the intern.default.getPlugin function in intern

"use strict";
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const intern = require("intern").default;
const { assert } = intern.getPlugin("chai");
const { registerSuite } = intern.getInterface("object");
const FunctionalHelpers = require("./lib/helpers.js");

var url = function(path) {
  return intern.config.siteRoot + path;
};

registerSuite("Index", {
  tests: {
    "front page loads"() {
      return FunctionalHelpers.openPage(this, url("/"), ".js-hero-title")
        .findByCssSelector(".js-hero-title")
        .getVisibleText()
        .then(function(text) {
          assert.equal(
            text.toLowerCase(),

"use strict";
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const intern = require("intern").default;
const { assert } = intern.getPlugin("chai");
const { registerSuite } = intern.getInterface("object");
const FunctionalHelpers = require("./lib/helpers.js");

var url = function(path) {
  return intern.config.siteRoot + path;
};

registerSuite("User Activity (auth)", {
  before() {
    return FunctionalHelpers.login(this);
  },

  after() {
    return FunctionalHelpers.logout(this);
  },

"use strict";
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const intern = require("intern").default;
const { assert } = intern.getPlugin("chai");
const { registerSuite } = intern.getInterface("object");
const FunctionalHelpers = require("./lib/helpers.js");

var url = function(path) {
  return intern.config.siteRoot + path;
};

registerSuite("Issues", {
  tests: {
    "Issue page loads"() {
      return FunctionalHelpers.openPage(this, url("/issues/100"), ".js-Issue")
        .findDisplayedByCssSelector(".js-issue-number")
        .getVisibleText()
        .then(function(text) {
          assert.include(text, "#100", "Issue title displayed");
        })

"use strict";
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const intern = require("intern").default;
const { assert } = intern.getPlugin("chai");
const { registerSuite } = intern.getInterface("object");
const FunctionalHelpers = require("./lib/helpers.js");

var url = path => intern.config.siteRoot + path;

registerSuite("Comments (auth)", {
  before() {
    return FunctionalHelpers.login(this);
  },

  after() {
    return FunctionalHelpers.logout(this);
  },

  tests: {
    "Comments form visible when logged in"() {

"use strict";
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const intern = require("intern").default;
const { assert } = intern.getPlugin("chai");
const { registerSuite } = intern.getInterface("object");
const FunctionalHelpers = require("./lib/helpers.js");
const path = require("path");

var cwd = intern.config.basePath;
var VALID_IMAGE_PATH = path.join(cwd, "tests/fixtures", "green_square.png");
// DETAILS_STRING is a URL encoded object, stringified to JSON.
var DETAILS_STRING =
  '{"gfx.webrender.all"%3Afalse%2C"gfx.webrender.blob-images"%3A2%2C"gfx.webrender.enabled"%3Afalse%2C"image.mem.shared"%3A2%2C"layout.css.servo.enabled"%3Atrue}';

var url = function(path) {
  return intern.config.siteRoot + path;
};

registerSuite("Reporting (non-auth)", {
  tests: {

"use strict";
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const intern = require("intern").default;
const { assert } = intern.getPlugin("chai");
const { registerSuite } = intern.getInterface("object");
const FunctionalHelpers = require("./lib/helpers.js");

var url = function(path) {
  return intern.config.siteRoot + path;
};

registerSuite("History navigation", {
  tests: {
    "Back button works from issues page"() {
      return (
        FunctionalHelpers.openPage(this, url("/"), ".js-issues-link")
          .findByCssSelector(".js-issues-link")
          .click()
          .end()
          // check that the page is loaded

"use strict";
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const intern = require("intern").default;
const { assert } = intern.getPlugin("chai");
const { registerSuite } = intern.getInterface("object");
const FunctionalHelpers = require("./lib/helpers.js");

var url = function(path, params) {
  var fullUrl =
    params !== undefined
      ? intern.config.siteRoot + path + params
      : intern.config.siteRoot + path;
  return fullUrl;
};

registerSuite("Search (auth)", {
  before() {
    return FunctionalHelpers.login(this);
  },

"use strict";
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const intern = require("intern").default;
const { assert } = intern.getPlugin("chai");
const { registerSuite } = intern.getInterface("object");
const FunctionalHelpers = require("./lib/helpers.js");

var url = function(path) {
  return intern.config.siteRoot + path;
};

registerSuite("Milestones (non-auth)", {
  tests: {
    "Page loads without milestone set": function() {
      return FunctionalHelpers.openPage(
        this,
        url("/issues/9"),
        ".js-Issue",
        true /* longerTimeout */
      )

"use strict";
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
const intern = require("intern").default;
const { assert } = intern.getPlugin("chai");
const { registerSuite } = intern.getInterface("object");
const FunctionalHelpers = require("./lib/helpers.js");

var url = function(path, params) {
  var base = intern.config.siteRoot + path;
  return params ? base + params : base;
};

registerSuite("Search (non-auth)", {
  tests: {
    "Pressing g inside of search input *doesnt* go to github issues"() {
      return (
        FunctionalHelpers.openPage(this, url("/issues"), "#js-SearchForm-input")
          .findByCssSelector("#js-SearchForm-input")
          .click()
          .type("g")

"use strict";
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*global WindowHelpers:true*/
const intern = require("intern").default;
const { assert } = intern.getPlugin("chai");
const { registerSuite } = intern.getInterface("object");
const FunctionalHelpers = require("./lib/helpers.js");

const url = intern.config.siteRoot + "/issues/new";

// This string is executed by calls to `execute()` in various tests
// it postMessages a small green test square.
const POSTMESSAGE_TEST_SQUARE =
  'postMessage("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABkAAAAZCAIAAABLixI0AAAACXBIWXMAAA7DAAAOwwHHb6hkAAAAB3RJTUUH3gYSAig452t/EQAAAClJREFUOMvtzkENAAAMg0A25ZU+E032AQEXoNcApCGFLX5paWlpaWl9dqq9AS6CKROfAAAAAElFTkSuQmCC", "http://localhost:5000")';

registerSuite("Image Uploads (non-auth)", {
  tests: {
    "postMessaged dataURI preview"() {
      return (
        FunctionalHelpers.openPage(this, url, ".js-image-upload")
          // send a small base64 encoded green test square