fuck WSL, finally no more hassels with ChromeHeadless

package.json

@@ -93,6 +93,7 @@
     "pre-commit": "^1.2.2",
     "pug": "^2.0.0",
     "pug-loader": "^2.4.0",
+    "puppeteer": "^1.19.0",
     "raw-loader": "^3.0.0",
     "regenerator-runtime": "^0.13.1",
     "rimraf": "^2.6.2",

test/unit/karma.conf.js

@@ -1,16 +1,18 @@
 const webpackConfig = require('../../build/webpack.test.conf')
 
+process.env.CHROME_BIN = require('puppeteer').executablePath()
+
 module.exports = config => {
   config.set({
     files: [ './index.js' ],
-    browsers: [ 'CustomChrome' ],
+    browsers: [ 'ChromeHeadlessWithoutSandbox' ],
     customLaunchers: {
-      CustomChrome: {
-        // `ChromeHeadless` without any flags used to be fine,
-        // but it is not now for some unknown reason.
+      ChromeHeadlessWithoutSandbox: {
+        // `ChromeHeadless` without any flags used to be working
+        // well, but it is not now for some unknown reason.
         // Adding `--no-sandbox` flag solves the issue, which
-        // I know is insecure. But since we are only running
-        // tests, there would be no problem.
+        // I know is insecure. But since we are only using
+        // Chrome to run the tests, it should be just fine.
         base: 'ChromeHeadless',
         flags: [ '--no-sandbox' ],
       },