diff --git a/test/dom/ComponentHarness.mocha.js b/test/dom/ComponentHarness.mocha.js
index 3273e7bd..7f22f37c 100644
--- a/test/dom/ComponentHarness.mocha.js
+++ b/test/dom/ComponentHarness.mocha.js
@@ -1,6 +1,6 @@
-var expect = require('chai').expect;
-var Component = require('../../src/components').Component;
-var domTestRunner = require('../../src/test-utils/domTestRunner');
+import { expect } from 'chai';
+import { Component } from '../../src/components';
+import * as domTestRunner from '../../src/test-utils/domTestRunner';
 
 describe('ComponentHarness', function() {
   var runner = domTestRunner.install();
diff --git a/test/dom/as.mocha.js b/test/dom/as.mocha.js
index e8229366..54a4094b 100644
--- a/test/dom/as.mocha.js
+++ b/test/dom/as.mocha.js
@@ -1,5 +1,5 @@
-var expect = require('chai').expect;
-var domTestRunner = require('../../src/test-utils/domTestRunner');
+import { expect } from 'chai';
+import * as domTestRunner from '../../src/test-utils/domTestRunner';
 
 describe('as', function() {
   var runner = domTestRunner.install({
diff --git a/test/dom/bindings.mocha.js b/test/dom/bindings.mocha.js
index 66318fef..27e4d2f9 100644
--- a/test/dom/bindings.mocha.js
+++ b/test/dom/bindings.mocha.js
@@ -1,5 +1,5 @@
-var expect = require('chai').expect;
-var domTestRunner = require('../../src/test-utils/domTestRunner');
+import { expect } from 'chai';
+import * as domTestRunner from '../../src/test-utils/domTestRunner';
 
 describe('bindings', function() {
   const runner = domTestRunner.install();
diff --git a/test/dom/components.browser.mocha.js b/test/dom/components.browser.mocha.js
index a998bcb0..ca0dce89 100644
--- a/test/dom/components.browser.mocha.js
+++ b/test/dom/components.browser.mocha.js
@@ -1,6 +1,6 @@
-const expect = require('chai').expect;
-const templates = require('../../src/templates').templates;
-const domTestRunner = require('../../src/test-utils/domTestRunner');
+import { expect } from 'chai';
+import { templates } from '../../src/templates';
+import * as domTestRunner from '../../src/test-utils/domTestRunner';
 
 describe('components', function() {
   const runner = domTestRunner.install();
diff --git a/test/dom/components.mocha.js b/test/dom/components.mocha.js
index 1d9adcca..5fca0364 100644
--- a/test/dom/components.mocha.js
+++ b/test/dom/components.mocha.js
@@ -1,7 +1,7 @@
-var expect = require('chai').expect;
-var pathLib = require('node:path');
-const { Component } = require('../../src/components');
-var domTestRunner = require('../../src/test-utils/domTestRunner');
+import { expect } from 'chai';
+import * as pathLib from 'node:path';
+import { Component } from '../../src/components';
+import * as domTestRunner from '../../src/test-utils/domTestRunner';
 
 describe('components', function() {
   var runner = domTestRunner.install();
diff --git a/test/dom/dom-events.mocha.js b/test/dom/dom-events.mocha.js
index d3a56631..ec26199c 100644
--- a/test/dom/dom-events.mocha.js
+++ b/test/dom/dom-events.mocha.js
@@ -1,5 +1,5 @@
-var expect = require('chai').expect;
-var domTestRunner = require('../../src/test-utils/domTestRunner');
+import { expect } from 'chai';
+import * as domTestRunner from '../../src/test-utils/domTestRunner';
 
 describe('DOM events', function() {
   const runner = domTestRunner.install();
diff --git a/test/dom/domTestRunner.mocha.js b/test/dom/domTestRunner.mocha.js
index 22e581a9..66be8f3e 100644
--- a/test/dom/domTestRunner.mocha.js
+++ b/test/dom/domTestRunner.mocha.js
@@ -1,4 +1,4 @@
-var domTestRunner = require('../../src/test-utils/domTestRunner');
+import * as domTestRunner from '../../src/test-utils/domTestRunner';
 
 describe('domTestRunner', function() {
   describe('with JSDOM option pretendToBeVisual', function() {
diff --git a/test/dom/forms.browser.mocha.js b/test/dom/forms.browser.mocha.js
index e4d00b31..54a434ac 100644
--- a/test/dom/forms.browser.mocha.js
+++ b/test/dom/forms.browser.mocha.js
@@ -1,12 +1,11 @@
-var expect = require('chai').expect;
-var domTestRunner = require('../../src/test-utils/domTestRunner');
+import { expect } from 'chai';
+import * as domTestRunner from '../../src/test-utils/domTestRunner';
 
 describe('forms', function() {
   const runner = domTestRunner.install();
-  const { window } = runner;
 
   function createEvent(type) {
-    return new window.Event(type, {bubbles: true});
+    return new runner.window.Event(type, {bubbles: true});
   }
 
   describe('textarea', function() {