Updated the browser testing

etc/eslint.json

@@ -6,6 +6,9 @@
     "node": true
   },
   "extends": "eslint:recommended",
+  "globals": {
+    "expect": "readonly"
+  },
   "parserOptions": {
     "ecmaVersion": 2019,
     "sourceType": "module"

etc/karma.js

@@ -1,25 +1,11 @@
-const {normalize, resolve} = require('path');
-const commonjs = require('rollup-plugin-commonjs');
-const nodeResolve = require('rollup-plugin-node-resolve');
-
 module.exports = config => config.set({
-  basePath: resolve(__dirname, '..'),
+  basePath: require('path').resolve(__dirname, '..'),
   browsers: ['FirefoxHeadless'],
   files: [
+    {pattern: 'lib/**/*.js', type: 'module'},
     {pattern: 'test/**/*.js', type: 'module'}
   ],
-  frameworks: ['mocha'],
-  preprocessors: {
-    'test/**/*.js': ['rollup']
-  },
+  frameworks: ['mocha', 'chai'],
   reporters: ['progress'],
-  rollupPreprocessor: {
-    onwarn: (warning, warn) => {
-      if (warning.code == 'CIRCULAR_DEPENDENCY' && warning.importer.includes(normalize('node_modules/chai'))) return;
-      warn(warning);
-    },
-    output: {extend: true, format: 'iife', name: 'window'},
-    plugins: [nodeResolve(), commonjs()]
-  },
   singleRun: true
 });

etc/mocha.json

@@ -2,6 +2,6 @@
   "check-leaks": true,
   "recursive": true,
   "reporter": "spec",
-  "require": "esm",
+  "require": ["esm", "chai/register-expect"],
   "ui": "bdd"
 }

package.json

@@ -23,14 +23,12 @@
     "gulp": "^4.0.2",
     "jsdoc": "^3.6.2",
     "karma": "^4.1.0",
+    "karma-chai": "^0.1.0",
     "karma-firefox-launcher": "^1.1.0",
     "karma-mocha": "^1.3.0",
-    "karma-rollup-preprocessor": "^7.0.0",
     "mocha": "^6.1.4",
     "nyc": "^14.1.1",
-    "rollup": "^1.15.6",
-    "rollup-plugin-commonjs": "^10.0.0",
-    "rollup-plugin-node-resolve": "^5.0.3"
+    "rollup": "^1.15.6"
   },
   "engines": {
     "node": ">=12.4.0",

test/enum_test.js

@@ -1,4 +1,3 @@
-import chai from 'chai';
 import {Enum} from '../lib/index.js';
 
 /**
@@ -14,8 +13,6 @@ const SampleEnum = Enum.create({
 
 /** Tests the features of the {@link Enum} class. */
 describe('EnumTest', () => {
-  const {expect} = chai;
-
   describe('#assert()', () => {
     it('should return the specified value if it is a known one', () => {
       expect(SampleEnum.assert(false)).to.equal(SampleEnum.zero);