change tests to mjs

this is necessary as Chai@v5 has moved to ESM only see #498 (comment)

tests/utils/get-element-type.js → tests/utils/get-element-type.mjs

@@ -1,10 +1,10 @@
-const {getElementType} = require('../../lib/utils/get-element-type')
-const {mockJSXAttribute, mockJSXConditionalAttribute, mockJSXOpeningElement} = require('./mocks')
+import {expect} from 'chai'
+import {getElementType} from '../../lib/utils/get-element-type'
+import {mockJSXAttribute, mockJSXConditionalAttribute, mockJSXOpeningElement} from './mocks'
 
 const mocha = require('mocha')
 const describe = mocha.describe
 const it = mocha.it
-const expect = require('chai').expect
 
 function mockSetting(componentSetting = {}) {
   return {

tests/utils/get-role.js → tests/utils/get-role.mjs

@@ -1,9 +1,7 @@
-const {getRole} = require('../../lib/utils/get-role')
-const {mockJSXAttribute, mockJSXConditionalAttribute, mockJSXOpeningElement} = require('./mocks')
-const mocha = require('mocha')
-const describe = mocha.describe
-const it = mocha.it
-const expect = require('chai').expect
+import {expect} from 'chai'
+import {getRole} from '../../lib/utils/get-role'
+import {mockJSXAttribute, mockJSXConditionalAttribute, mockJSXOpeningElement} from './mocks'
+import {describe, it} from 'mocha'
 
 describe('getRole', function () {
   it('returns undefined when polymorphic prop is set with a non-literal expression', function () {

tests/utils/object-map.js → tests/utils/object-map.mjs

@@ -1,7 +1,7 @@
 // @ts-check
-const ObjectMap = require('../../lib/utils/object-map')
-const {describe, it} = require('mocha')
-const expect = require('chai').expect
+import {expect} from 'chai'
+import ObjectMap from '../../lib/utils/object-map'
+import {describe, it} from 'mocha'
 
 describe('ObjectMap', function () {
   it('constructs an ObjectMap', function () {