Set chrome binary to chrome installed by puppeteer

See https://github.com/karma-runner/karma-chrome-launcher#headless-chromium-with-puppeteer

Author: koddsson

test/karma.config.js

@@ -1,4 +1,7 @@
-// eslint-disable-next-line filenames/match-regex, import/no-commonjs
+// eslint-disable-next-line filenames/match-regex, import/no-commonjs, @typescript-eslint/no-var-requires
+process.env.CHROME_BIN = require('puppeteer').executablePath()
+
+// eslint-disable-next-line import/no-commonjs
 module.exports = function (config) {
   config.set({
     frameworks: ['mocha', 'chai'],