Karma Setup with Chrome Headless + Jasmine + Webpack

example.test.js

import { guid } from '../../src/hash';

describe("Hash - Guid", () => {
    it ('should output a string value', () => {
        let g = guid();
        expect(g).toEqual(jasmine.any(String));
    });
});

// Based on the tests for @valkyriestudios/utils (github.com/valkyriestudios/utils)

karma.conf.js

module.exports = function(config) {
    config.set({
        basePath: './',
        frameworks: ['jasmine'],
        files: [
            {pattern: 'test/test_index.js'},
        ],
        exclude: [],
        preprocessors: {
            'test/test_index.js': ['webpack'],
        },
        webpack: {
            mode: 'development',
        },
        webpackMiddleware: {
            noInfo: true,
            stats: {
                chunks: false,
            },
        },
        reporters: ['progress'],
        port: 9876,
        colors: true,
        logLevel: config.LOG_INFO,
        autoWatch: true,
        browsers: ['ChromeHeadless'],
        singleRun: false,
        customLaunchers: {
            ChromeHeadless: {
                base: 'Chrome',
                flags: [
                    '--no-sandbox',
                    '--headless',
                    '--disable-gpu',
                    '--remote-debugging-port=9222',
                ],
            },
        },
    });
};

package.json

{
  "scripts": {
    "test": "karma start karma.conf.js",
  },
  "devDependencies": {
    "babel-core": "^6.26.3",
    "babel-loader": "^7.1.5",
    "babel-preset-env": "^1.7.0",
    "jasmine-core": "^3.1.0",
    "karma": "^2.0.5",
    "karma-chrome-launcher": "^2.2.0",
    "karma-jasmine": "^1.1.2",
    "karma-webpack": "^3.0.0",
    "puppeteer": "^1.6.1",
    "webpack": "^4.16.3"
  }
}

test_index.js

var testsContext = require.context(".", true, /\.test\.js$/);
testsContext.keys().forEach(testsContext);