configure karma to use chromium

Author: theinterned

karma.config.cjs

@@ -1,4 +1,6 @@
-module.exports = function(config) {
+process.env.CHROME_BIN = require('chromium').path
+
+module.exports = function (config) {
   config.set({
     frameworks: ['mocha', 'chai'],
     files: [
@@ -9,7 +11,7 @@ module.exports = function(config) {
     port: 9876,
     colors: true,
     logLevel: config.LOG_INFO,
-    browsers: ['ChromeHeadless', 'FirefoxHeadless'],
+    browsers: ['ChromeHeadless'],
     autoWatch: false,
     singleRun: true,
     concurrency: Infinity