doc(readme): Information about Karma in the readme

test(karma): Fix variable to make linter happy

README.md

@@ -73,6 +73,14 @@ npm run-script build
 npm test
 ```
 
+### Testing (karma)
+Karma allows testing within one or several browser.
+
+```bash
+karma start --singleRun=true --browsers="Chrome,Firefox"
+```
+
+
 **Please note this repo is in it's early stage.**
 
 If you'd like to run a Http ethereum node check out

karma.conf.js

@@ -78,7 +78,7 @@ module.exports = function (config) {
         browserDisconnectTimeout: 5000,
 
         customLaunchers: {
-            chrome_without_security: {
+            chromeWithoutSecurity: {
                 base: 'Chrome',
                 flags: ['--disable-web-security']
             },