Convert test suite to ESM (#391)

eslint.config.mjs

@@ -5,7 +5,7 @@ export default [
   js.configs.recommended,
   {
     languageOptions: {
-      ecmaVersion: 2018,
+      ecmaVersion: 2020,
       globals: {
         ...globals.mocha,
         ...globals.node,

package.json

@@ -29,7 +29,7 @@
   "scripts": {
     "lint": "eslint ./",
     "test": "npm run lint && npm run unit-test",
-    "unit-test": "nyc mocha tests/**/*.js"
+    "unit-test": "nyc mocha tests/**/*.mjs"
   },
   "peerDependencies": {
     "eslint": ">=2.0.0 <= 9.x"

tests/index.js → tests/index.mjs

@@ -1,11 +1,16 @@
 /* eslint-env mocha */
 'use strict';
 
-const plugin = require('..');
+import plugin from '../index.js';
 
-const assert = require('assert');
-const fs = require('fs');
-const path = require('path');
+import assert from 'node:assert';
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
 let rules = fs.readdirSync(path.resolve(__dirname, '../lib/rules/'))
   .map((f) => {

tests/lib/rules/missing-assertions.js → tests/lib/rules/missing-assertions.mjs

@@ -1,8 +1,11 @@
 'use strict';
 
-const rule = require('../../../lib/rules/missing-assertion');
+import {ecmaVersion} from './utils.mjs';
+import rule from '../../../lib/rules/missing-assertion.js';
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
 const {RuleTester} = require('eslint');
-const {ecmaVersion} = require('./utils');
 
 let ruleTester = new RuleTester();
 ruleTester.run('missing-assertion', rule, {

tests/lib/rules/no-inner-compare.js → tests/lib/rules/no-inner-compare.mjs

@@ -1,6 +1,9 @@
 'use strict';
 
-const rule = require('../../../lib/rules/no-inner-compare');
+import rule from '../../../lib/rules/no-inner-compare.js';
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
 const {RuleTester} = require('eslint');
 
 let ruleTester = new RuleTester();

tests/lib/rules/no-inner-literal.js → tests/lib/rules/no-inner-literal.mjs

@@ -1,8 +1,11 @@
 'use strict';
 
-const rule = require('../../../lib/rules/no-inner-literal');
+import rule from '../../../lib/rules/no-inner-literal.js';
+import {ecmaVersion} from './utils.mjs';
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
 const {RuleTester} = require('eslint');
-const {ecmaVersion} = require('./utils');
 
 let ruleTester = new RuleTester();
 ruleTester.run('no-inner-literal', rule, {

tests/lib/rules/terminating-properties.js → tests/lib/rules/terminating-properties.mjs

@@ -1,6 +1,9 @@
 'use strict';
 
-const rule = require('../../../lib/rules/terminating-properties');
+import rule from '../../../lib/rules/terminating-properties.js';
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
 const {RuleTester} = require('eslint');
 
 let ruleTester = new RuleTester();

tests/lib/rules/utils.js → tests/lib/rules/utils.mjs

@@ -1,8 +1,11 @@
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
 const eslintPkg = require('eslint/package.json');
 
 const USE_LANGUAGE_OPTIONS = eslintPkg.version.startsWith('9.');
 
-function ecmaVersion(version) {
+export function ecmaVersion(version) {
   if (USE_LANGUAGE_OPTIONS) {
     return {
       languageOptions: {
@@ -17,7 +20,3 @@ function ecmaVersion(version) {
     }
   }
 }
-
-module.exports = {
-  ecmaVersion
-};

tests/lib/util/find-expect-call.js → tests/lib/util/find-expect-call.mjs

@@ -1,9 +1,12 @@
 'use strict';
 
-const importFrom = require('import-from');
-const {expect} = require('chai');
+import { createRequire } from 'node:module';
+import importFrom from 'import-from';
+import {expect} from 'chai';
+import findExpectCall from '../../../lib/util/find-expect-call.js';
+
+const require = createRequire(import.meta.url);
 const espree = importFrom(require.resolve('eslint'), 'espree');
-const findExpectCall = require('../../../lib/util/find-expect-call');
 
 describe('find-expect-call util', function () {
   it('Finds expect statements which are considered member expressions', function () {